#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <cmath>
#include <iomanip>
#include <map>
using namespace std;
typedef long long LL;

int main(){
    string ns, ms;
    cin >> ns >> ms;
    LL N = ns[ns.size()-1] - '0';
    LL M = ms[ms.size()-1] - '0';
    if(ms.size() >= 2) M += 10 * (ms[ms.size()-2]-'0');
    LL ans = 1;
    if(N == 0) ans = 0;
    for(int i = 0; i < M; i++){
        ans = ans*N % 10;
    }
    cout << ans << endl;
    return 0;
}