#include <iostream>
#include <cmath>
using namespace std;

int main(){
   unsigned long long n,m;
   cin >> n >> m;
   if(m == 0){
      cout << 1 << endl;
      return 0;
   }
   n %= 10;
   m %= 4;
   if(!m) m = 4;
   cout << int(pow(n,m)) % 10 << endl;
}