#include <iostream>

int main()
{
    int n = 0;
    int two = 0;
    std::cin >> n;
    int start = 1;
    int temp = 0;
    for (int i = 1; i <= n; i++) {
        temp = i;
        if (temp % 2 == 0) {
            two++;
            temp /= 2;
        }
        while (temp % 5 == 0) {
            temp /= 5;
            two--;
        }
        start = start * temp;
        start %= 10;
    }
    switch (two % 4) {
        case 1:
            start = (start * 2) % 10;
            break;
        case 2:
            start = (start * 4) % 10;
            break;
        case 3:
            start = (start * 8) % 10;
            break;
        case 4:
            start = (start * 6) % 10;
            break;
    }

    std::cout << start << std::endl;
}