/*
ID: fniksic001
PROG: fact4
LANG: C++
*/

#include <fstream>

using namespace std;

int main() {
    ifstream in("fact4.in");
    ofstream out("fact4.out");

    int N, twos, fives = 0;
    in >> N;

    for (int p = 5; p <= N; p *= 5)
	fives += N / p;
    twos = fives;

    int digit = 1;
    for (int i = 2; i <= N; ++i) {
	int temp = i;
	while (temp % 5 == 0 && fives > 0) {
	    temp /= 5;
	    --fives;
	}
	while (temp % 2 == 0 && twos > 0) {
	    temp /= 2;
	    --twos;
	}
	digit *= temp;
	digit %= 10;
    }

    out << digit << endl;
    
    return 0;
}