#include <bits/stdc++.h>
using namespace std;


int main(){
    int n;	cin >> n;
	double r;	cin >> r;

	double ans = 0.0;
	double now = 100.0;
	for(int i = 0; i < n; ++i){
		ans += now;
		now *= 1.0 - r;
	}
	printf("%.9f\n", ans);

    return 0;
}