#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

int main() {
    string n, m;
    cin >> n >> m;
    int nval = stoi(n[n.length()-1] + ""s);
    int mval = stoi(m[m.length()-1] + ""s);
    mval = m.length() > 1 && mval == 0 ? 10 : mval;

    llong result = 1;
    rep(i, mval) result *= nval;
    cout << result % 10 << endl;
}