#include<iostream>
#include<iomanip>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<list>
#include<queue>
#include<math.h>
#include<bitset>
using ll = long long;
using namespace std;

int main(){
    ll n, m, i = 1, diff = 0, s = -1;
    cin >> n >> m;
    ll r = n, m1 = m;
    vector<ll> modulo(11, -1);
    while(1){
        r %= 10;
        for (int j = 1; j <= 10; j++){
            if (modulo[j] == r){
                diff = i -j;
                s = j;
                m1 -= j;
                m1 %= diff;
                m1 += j;
                if (diff == 1) cout << modulo[s] << endl;
                else cout << modulo[m1] << endl;
                return 0;
            }
        }
        modulo[i] = r;
        i++;
        r *= n;
    }
}