#include <bits/stdc++.h>

#define REP(i, x, n) for(int i = x; i < (int)(n); i++)
#define rep(i, n) REP(i, 0, n)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define F first
#define S second
#define mp make_pair

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> P;

int main() {
  // ios_base::sync_with_stdio(false);
  vector<vector<int>> v(10);
  rep(i, 10) {
    vector<int> flg(10, false);
    int tmp = 1;
    while(1) {
      tmp *= i;
      if(flg[tmp % 10]) break;
      flg[tmp % 10] = true;
      v[i].push_back(tmp % 10);
    }
  }

  // rep(i, 10) {
  //   rep(j, v[i].size()) {
  //     cout << v[i][j] << ' ';
  //   }
  //   cout << endl;
  // }
  
  string N, M;
  cin >> N >> M;
  
  int n = N.back() - '0';
  int m;
  if(v[n].size() == 1) m = 0;
  else if(v[n].size() == 2) {
    m = (M.back() - '0' + 1) % 2;
  }
  else {
    int sz = M.size();
    if(sz > 1) {
      m = (10 * (M[sz - 2] - '0') + (M[sz - 1] - '0') + 3) % 4;
    }
    else {
      m = (M[sz - 1] - '0' + 3) % 4;
    }
  }

  if(M == "0") {
    n = 1;
    m = 0;
  }
  
  cout << v[n][m] << endl;
  
  return 0;
}