Omenat

//package Omenat;
import java.util.*;
import java.io.*;

public class Main {

	private static int search(ArrayList<Integer> apples,int sum,int depth){
		int minValue=Integer.MAX_VALUE;
		for(int i=0;i<apples.size();i++){
			int n=sum-apples.get(i);
			if(n%3==0){
				return depth;
			}else{
				int value=apples.get(i);
				apples.remove(i);
				int d=search(apples,n,depth+1);
				minValue=Math.min(minValue, d);
				apples.add(i, value);
			}
		}
		return minValue;
	}
	public static int main(String[] args) {
		IO io = new IO();
		int appleCount=io.nextInt();
		ArrayList<Integer>  apples=new ArrayList<Integer>();
		int base=0;
		int sum=0;
		for(int i=0;i<appleCount;i++){
			int apple=io.nextInt();
			if(apple%3==0){
				base++;
				
			}
			else{
				apples.add(apple);
				sum+=apple;
			}
		}
		int d=search(apples,sum,1);
		int result=base + (appleCount-base-d);
		io.print(result);
		/*String a = io.next(); // Lukee seuraavan välein erotellun merkkijonon.
		int b = io.nextInt(); // Lukee seuraavan välein erotellun int-kokonaisluvun.
		long c = io.nextLong(); // Lukee seuraavan välein erotellun long-kokonaisluvun.
		double d = io.nextDouble(); // Lukee seuraavan välein erotellun double-liukuluvun.
		
		// Toimii kuten System.out.println.
		io.println("Annoit syötteenä " + a + " " + b + " " + c + " " + d);
		*/
		io.close(); // TÄYTYY KUTSUA LOPUKSI, muuten tuloste voi jäädä kirjoittamatta
		return 0;
	}

}
class IO extends PrintWriter {
	private InputStreamReader r;
	private static final int BUFSIZE = 1 << 15;
	private char[] buf;
	private int bufc;
	private int bufi;
	private StringBuilder sb;
	
	public IO() {
		super(new BufferedOutputStream(System.out));
		r = new InputStreamReader(System.in);
		
		buf = new char[BUFSIZE];
		bufc = 0;
		bufi = 0;
		sb = new StringBuilder();
	}
	
	private void fillBuf() throws IOException {
		bufi = 0;
		bufc = 0;
		while(bufc == 0) {
			bufc = r.read(buf, 0, BUFSIZE);
			if(bufc == -1) {
				bufc = 0;
				return;
			}
		}
	}
	
	private boolean pumpBuf() throws IOException {
		if(bufi == bufc) {
			fillBuf();
		}
		return bufc != 0;
	}
	
	private boolean isDelimiter(char c) {
		return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\f';
	}
	
	private void eatDelimiters() throws IOException {
		while(true) {
			if(bufi == bufc) {
				fillBuf();
				if(bufc == 0) throw new RuntimeException("IO: Out of input.");
			}
			
			if(!isDelimiter(buf[bufi])) break;
			++bufi;
		}
	}
	
	public String next() {
		try {
			sb.setLength(0);
			
			eatDelimiters();
			int start = bufi;
			
			while(true) {
				if(bufi == bufc) {
					sb.append(buf, start, bufi - start);
					fillBuf();
					start = 0;
					if(bufc == 0) break;
				}
				
				if(isDelimiter(buf[bufi])) break;
				++bufi;
			}
			
			sb.append(buf, start, bufi - start);
			
			return sb.toString();
		} catch(IOException e) {
			throw new RuntimeException("IO.next: Caught IOException.");
		}
	}
	
	public int nextInt() {
		try {
			int ret = 0;
			
			eatDelimiters();
			
			boolean positive = true;
			if(buf[bufi] == '-') {
				++bufi;
				if(!pumpBuf()) throw new RuntimeException("IO.nextInt: Invalid int.");
				positive = false;
			}
			
			boolean first = true;
			while(true) {
				if(!pumpBuf()) break;
				if(isDelimiter(buf[bufi])) {
					if(first) throw new RuntimeException("IO.nextInt: Invalid int.");
					break;
				}
				first = false;
				
				if(buf[bufi] >= '0' && buf[bufi] <= '9') {
					if(ret < -214748364) throw new RuntimeException("IO.nextInt: Invalid int.");
					ret *= 10;
					ret -= (int)(buf[bufi] - '0');
					if(ret > 0) throw new RuntimeException("IO.nextInt: Invalid int.");
				} else {
					throw new RuntimeException("IO.nextInt: Invalid int.");
				}
				
				++bufi;
			}
			
			if(positive) {
				if(ret == -2147483648) throw new RuntimeException("IO.nextInt: Invalid int.");
				ret = -ret;
			}
			
			return ret;
		} catch(IOException e) {
			throw new RuntimeException("IO.nextInt: Caught IOException.");
		}
	}
	
	public long nextLong() {
		try {
			long ret = 0;
			
			eatDelimiters();
			
			boolean positive = true;
			if(buf[bufi] == '-') {
				++bufi;
				if(!pumpBuf()) throw new RuntimeException("IO.nextLong: Invalid long.");
				positive = false;
			}
			
			boolean first = true;
			while(true) {
				if(!pumpBuf()) break;
				if(isDelimiter(buf[bufi])) {
					if(first) throw new RuntimeException("IO.nextLong: Invalid long.");
					break;
				}
				first = false;
				
				if(buf[bufi] >= '0' && buf[bufi] <= '9') {
					if(ret < -922337203685477580L) throw new RuntimeException("IO.nextLong: Invalid long.");
					ret *= 10;
					ret -= (long)(buf[bufi] - '0');
					if(ret > 0) throw new RuntimeException("IO.nextLong: Invalid long.");
				} else {
					throw new RuntimeException("IO.nextLong: Invalid long.");
				}
				
				++bufi;
			}
			
			if(positive) {
				if(ret == -9223372036854775808L) throw new RuntimeException("IO.nextLong: Invalid long.");
				ret = -ret;
			}
			
			return ret;
		} catch(IOException e) {
			throw new RuntimeException("IO.nextLong: Caught IOException.");
		}
	}
	
	public double nextDouble() {
		return Double.parseDouble(next());
	}
}

Test 1

Group: 1

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 2

Group: 1

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 3

Group: 1

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 4

Group: 1

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 5

Group: 1

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 6

Group: 1

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 7

Group: 2

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 8

Group: 2

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 9

Group: 2

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 10

Group: 2

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 11

Group: 2

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 12

Group: 2

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 13

Group: 3

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 14

Group: 3

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 15

Group: 3

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 16

Group: 3

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 17

Group: 3

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)

Test 18

Group: 3

Verdict: RUNTIME ERROR

Error: Main method must return a value of type void in class Main, please 
define the main method as:
   public static void main(String[] args)