#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;
constexpr double PI = 3.14159265358979323846;

int main(){
    string n,m;
    cin >> n >> m;
    int a = n[n.size()-1] - '0';
    int b = 0;
    int t = 1;
    for(int i=m.size()-1;i>=0;i--){
        b = (b + t * (m[i]-'0') )%4;
        t = (t * 2) % 4;
    }
    int ans = 1;
    rep(i,b) ans *= a;
    cout << (ans%10) << endl;
    return 0;
}