#include <iostream>
using ll = long long;
using namespace std;

int main() {
    string n, m;
    int a, b = 1;
    cin >> n >> m;
    a = n.back()- '0';
    b = (stoi(m.substr(m.size() >= 2? m.size()-2 : 0) ) -1 ) % 4;
    for (int i = 0; i < b; ++i) {
        a =(a * a)%10;
    }
    cout << a << "\n";
    return 0;
}