#include<iostream>
#include<cstdio>
#include<algorithm>
#include<vector>
#include<string>
#include<cstring>
#include<climits>
#include<functional>
#include<map>
#include<set>
#include<queue>
#include<cmath>
using namespace std;

signed main(){
	string N,M;
	cin>>N>>M;
	reverse(N.begin(),N.end());
	reverse(M.begin(),M.end());
	vector<int> latte;
	if(M.size()==1){
		M.resize(2); M[1] = '0';
	}
	int calc = 1, cnt = (M[1]-'0')*10+(M[0]-'0')+4;
	for(int i=0;i<cnt;i++) calc = calc*(N[0]-'0')%10;
	printf("%d\n",calc);
	return 0;
}