#include <bits/stdc++.h>
#define p(s) cout<<(s)<<endl
typedef long long ll;
using namespace std;
const int inf=1e9;

ll fast_power(ll a, ll b, ll m){
	ll ret=1;
	while(b>0){
		if(b & 1){
			ret*=a;
		}
		a*=a;
		a%=m;
		ret%=m;
		b >>= 1;
	}
	return ret;
}
int main(){
	string s1,s2;
	cin>>s1>>s2;
	ll ans=fast_power(s1.back()-'0',s2.back()-'0',10);
	p(ans%10);
	return 0;
}