#include <iomanip>
#include <iostream>
using namespace std;
int N; long double R, T, a[1009], b[1009];
int main() {
	cin >> N >> R >> T;
	a[1] = R, b[1] = T;
	for (int i = 1; i < N; i++) {
		a[i + 1] = a[i] + R * b[i] * b[i] / (1.0l - R * a[i]);
		b[i + 1] = T * b[i] / (1.0l - R * a[i]);
	}
	cout << fixed << setprecision(17) << a[N] << '\n';
	return 0;
}