#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;
	int c = 1; latte.push_back(1);
	for(int i=0;;i++){
		c *= (N[0]-'0'); c%=10;
		for(int j=0;j<latte.size();j++){
			if(latte[j]==c){
				latte.erase(latte.begin(),latte.begin()+j);
				goto END;
			}
		}
		latte.push_back(c);
	}END:
	printf("%d\n",latte[(M[0]-'0'-1+latte.size())%latte.size()]);
	return 0;
}