#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<(n);i++)//0-indexed
#define REP(i,j,n) for(int i=j;i<(n);i++)
#define all(a) (a).begin(),(a).end()
#define sort(a) sort(all(a))
#define reverse(a) reverse(all(a))
#define INF 1e9
namespace mp = boost::multiprecision;
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};

//power
mp::cpp_int mypower(mp::cpp_int a,mp::cpp_int b,mp::cpp_int m){
    mp::cpp_int res=1,x=a;
    while(b){
        if(b&1){
            res=(res*x)%m;
        }
        x=(x*x)%m;
        b>>=1;
    }
    return res;
}

int main(){
    mp::cpp_int n,m;
    cin>>n>>m;
    cout<<mypower(n,m,10)<<endl;

}