Kertoma

import java.math.BigInteger;
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 jaljella = numerot[0];
        int[] maarat = new int[8];
        int kerroin = 97656; // * 5n+1  8 kertaa,
        for (int i = 0; i < 8; i++) {
            int maara = (int) (jaljella / (double) kerroin);

            jaljella -= maara;
            maarat[7 - i] = maara;

            kerroin -= 1;
            kerroin *= 0.2;
        }

        int perus = maarat[0] * 5; // Jos kaikki nollat olisivat luvun lopussa, tämä luku olisi

        BigInteger perusBig = new BigInteger(perus + "");
        BigInteger kertoma = kertoma(perusBig);
        while (perus >= 10) {
            int pituus = kertoma.toString(10).length();
            if (pituus == yhteensa) {
                System.out.print(perus);
                return;
            }
            perus--;
            kertoma = kertoma(new BigInteger(perus + ""));
        }

    }

    public static BigInteger kertoma(BigInteger luku) {
        if (luku.compareTo(BigInteger.ONE) == 0) {
            return luku;
        }

        return kertoma(luku.subtract(BigInteger.ONE)).multiply(luku);
    }

    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: 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: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 16

Group: 3

Verdict: TIME LIMIT EXCEEDED