#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <set>
#include <map>
#include <queue>
#include <iostream>
#include <sstream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstring>
#include <cctype>
#include <cassert>
#include <limits>
#include <functional>
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define rer(i,l,u) for(int (i)=(int)(l);(i)<=(int)(u);++(i))
#define reu(i,l,u) for(int (i)=(int)(l);(i)<(int)(u);++(i))
#if defined(_MSC_VER) || __cplusplus > 199711L
#define aut(r,v) auto r = (v)
#else
#define aut(r,v) __typeof(v) r = (v)
#endif
#define each(it,o) for(aut(it, (o).begin()); it != (o).end(); ++ it)
#define all(o) (o).begin(), (o).end()
#define pb(x) push_back(x)
#define mp(x,y) make_pair((x),(y))
#define mset(m,v) memset(m,v,sizeof(m))
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3fLL
using namespace std;
typedef vector<int> vi; typedef pair<int,int> pii; typedef vector<pair<int,int> > vpii; typedef long long ll;
template<typename T, typename U> inline void amin(T &x, U y) { if(y < x) x = y; }
template<typename T, typename U> inline void amax(T &x, U y) { if(x < y) x = y; }

int digitsMod(const char s[], int n, int m) {
	int x = 0; long long pow10 = 1;
	for(int i = n-1; i >= 0; i --) {
		if((x += pow10 * (s[i] - '0') % m) >= m) x -= m;
		pow10 = pow10 * 10 % m;
	}
	return x;
}

unsigned powmod(unsigned long long a, unsigned long long k, const unsigned MOD) {
	a %= MOD;
	unsigned long long r = MOD == 1 ? 0 : 1;
	while(k) {
		if(k & 1)
			(r *= a) %= MOD;
		(a *= a) %= MOD;
		k >>= 1;
	}
	return (unsigned)r;
}

int main() {
	string N, M;
	cin >> N >> M;
	int n = digitsMod(N.c_str(), N.size(), 10);
	int m = digitsMod(M.c_str(), M.size(), 20);
	if(M.size() >= 2) m += 4;
	int ans = powmod(n, m, 10);
	printf("%d\n", ans);
	return 0;
}