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

int main()
{
	long double p, q;
	cin >> p >> q;
	p /= 100;
	q /= 100;
	long double a = (1 - p) * q, b = (1 - p) * (1 - q), c = p * (1 - q), d = p * q;
	cout << fixed << setprecision(20) << 100 * d / (b + d) << endl;
	return 0;
}