#include <iostream>

using namespace std;

int main() {
    int n;
    cin >> n;

    int res = 1;
    int x, c2 = 0, c5 = 0;
    for (int i = 1; i <= n; ++i) {
        x = i;
        while (x % 2 == 0) {
            x /= 2;
            ++c2;
        }
        while (x % 5 == 0) {
            x /= 5;
            ++c5;
        }
        res = res * x % 10;
    }

    for (int i = 0; i< c2 - c5; ++i) {
        res = res * 2 % 10;
    }

    cout << res << endl;

    return 0;
}