Conjecture

//package programs.helsinki_contest1;
import java.util.*;

public class Task2
{
  public static void main(String[] args)
  {
   Scanner s = new Scanner(System.in);
      int n = s.nextInt();
      n++;
    while (true) { 
      if (n%3 != 0 && n >= 7)
       {
        System.out.print(n);
        return;
      }  n++;
      
    } 
  }
  
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED