#include <iostream>
#include <string>
#include <cmath>

using namespace std;

int main() {
	string n, m;
	cin >> n >> m;
	static int lsd[10][10]; // [n][m]
	for (int n = 0; n < 10; ++n) {
		lsd[n][0] = 1;
		for (int m = 1; m < 10; ++m) {
			lsd[n][m] = lsd[n][m - 1] * n % 10;
		}
	}
	cout << lsd[(n.back() - '0')][(m.back() - '0')] << endl;
	return 0;
}