Kertoma

import java.util.*;
 
public class Kertoma {
 
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String vals = scan.nextLine();
        String[] sList = vals.split(" ");
        
        Integer[] list = new Integer[sList.length];
        for (int i = 0; i < sList.length; i++) {
            list[i] = Integer.parseInt(sList[i]);
        }
        
        int sum = list[0] + list[1] + list[2] + list[3] + list[4] + list[5] + list[6] + list[7] + list[8] + list[9];
        
        if (sum == 1) {
            if (list[1] == 1) System.out.println("1");
            else if (list[2] == 1) System.out.println("2");
            else if (list[6] == 1) System.out.println("3");
        } else if (sum == 2) {
            System.out.println("4");
        } else if (sum == 3) {
            if (list[1] == 1) System.out.println("5");
            else if (list[7] == 1) System.out.println("6");
        } else {
            double length = Math.log10(720);
            for (int i = 7; i <= 1000000; i++) {
                length += Math.log10(i);
                if (sum == (int) (length + 1)) {
                    System.out.println(i);
                    break;
                }
            }
        }
    }
}

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: ACCEPTED

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 2, 3

Verdict: ACCEPTED

Test 10

Group: 2, 3

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED

Test 16

Group: 3

Verdict: ACCEPTED