Conjecture

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//package kilo_vika_eimaven;

/**
 *
 * @author asjuvone
 */
public class T5 {
    public static void main(String[] args) {
        IO io = new IO();
        int n = io.nextInt();
        n = Math.max(n, 5);
        n++;
        
        for (; true; n++) {
            if (n%3 != 0) break;
        }
        
        System.out.println(n);
        io.close();
    }
}

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