// WA(?)

#include <iostream>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
using namespace std;


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

	double ans = 0.0;
	double now = 100.0;
	rep(i, 0, n) {
		ans += now;
		now *= 1.0 - r;
	}

	cout << ans << endl;
	return 0;
}