#include <bits/stdc++.h>

using namespace std;

int main() {
	int N;
	cin >> N;
	double R;
	cin >> R;
	double x = 100.0;
	double ans = 0.0;
	for (int i = 0; i < N; i++) {
		ans += x;
		if (i + 1 < N) {
			x = (1.0 - R) * x;
		}
	}
	cout << fixed << setprecision(16) << ans << endl;
	return 0;
}