#include <iostream>

using namespace std;

int main()
{
	long long int N, M;
	cin >> N >> M;
	int p = N % 10;
	if (M == 0) {
		cout << 1;
		return 0;
	}
	long long int t = M;
	int k = p;
	int i = 0;
	do {
		k = (k * p) % 10;
		i++;
	} while (!(k == p));
	t = M % i - 1 + i;
	for (int i = 0; i < t; i++) {
		int x = N % 10;
		p *= x;
		p = p % 10;
	}
	cout << p;

	

	getchar();
	getchar();
	return 0;
}