#include <bits/stdc++.h>
using namespace std;
int main(){
	int N;
	cin >> N;
	double R;
	cin >> R;
	double ans = 0;
	double x = 100;
	for (int i = 0; i < N; i++){
		ans += x;
		x *= 1 - R;
	}
	cout << fixed << setprecision(20) << ans << endl;
}