#include<bits/stdc++.h>
using namespace std;

int main(){
    long int a, b, i, x, m;
    cin>>a>>b;
    x = a;
    for(i = 2; i <= b; ++i){
        m = x * a;
        x = m % 10;
    }
    cout<<x<<endl;
    return 0;
}