#include <bits/stdc++.h>
using namespace std;
int main() {
	int x, n, s = 1, sum;
	cin >> x >> n;
	sum = 1;
	for (int i = 1; i <= n; i++) {
		sum+=x*s;
		s+=x*s;
	}
	cout << sum;
	return 0;
}