#include<cstdio>
#include<cmath>
#include<iostream>
#include<algorithm>
#include<queue>
using namespace std;
int main(){
    int N,M;
    cin>>N>>M;
    int ans=1;
    for(int i=0;i<M;i++)ans=ans*N%10;
    printf("%d\n",ans);
    return 0;
}