#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <algorithm>

using namespace std;
int n;

int main() {
    scanf("%d",&n);
    int d = 1,e = n % 10;
    while(n) {
        if(n % 2) d = (d * e) % 10;
        e = (e * e) % 10;
        n /= 2;
    }
    printf("%d",d);
    return 0;
}