Kertoma

import java.util.Scanner;

public class C {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String[] numerotString = scanner.nextLine().split(" ");
        int[] numerot = new int[10];
        int yhteensa = 0;

        for (int i = 0; i < 10; i++) {
            numerot[i] = Integer.parseInt(numerotString[i]);
            yhteensa += numerot[i];
        }

        if (yhteensa <= 6) {
            System.out.print(pienempiKuin10(numerot));
            return;
        }

        int max = 1000;
        double factorial = 10 * 9 * 8 * 7* 6 * 5 * 4 * 3 * 2;
        for (int i = 11; i <= max; i++) {
            factorial *= i;
            if (Math.floor( Math.log10(factorial)) + 1 == yhteensa) {
                System.out.print(i);
                return;
            }
        }
        System.out.println(-1);


    }

    public static int pienempiKuin10(int[] numerot) {
        if (numerot[2] == 1) { // 2 4 5 6 8 9

            if (numerot[0] == 1) { // 5 6 9
                if (numerot[1] == 1)return 5;
                if (numerot[7] == 1)return 6;
                return 9;
            } else { // 2 4 8
                if (numerot[4] == 0)return 2;
                if (numerot[0] == 0)return 4;
                return 8;
            }

        } else { // 1 3 7
            if (numerot[1] == 1)return 1;
            if (numerot[6] == 1)return 3;
            return 7;
        }
    }

}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 2, 3

Verdict: WRONG ANSWER

Test 8

Group: 2, 3

Verdict: WRONG ANSWER

Test 9

Group: 2, 3

Verdict: WRONG ANSWER

Test 10

Group: 2, 3

Verdict: WRONG ANSWER

Test 11

Group: 3

Verdict: WRONG ANSWER

Test 12

Group: 3

Verdict: WRONG ANSWER

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER

Test 16

Group: 3

Verdict: WRONG ANSWER