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

int mulm(int a, int b) {
  return ((a % 10) * (b % 10)) % 10;
}

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