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

int main() {
  int N; int M;
  cin >> N;
  cin >> M;
  int n = N % 10;
  int A = n;
  for (int i = 0; i < M-1; i++) {
    A *= n;
    if (A >= 10) {
      A %= 10;
    }
  }
  cout << A << endl;
}