#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    long double p, q;
    cin >> p >> q;

    long double hoge = (100 - p) * (100 - q) + p * q;
    cout << fixed << setprecision(15) << (100 * p * q) / hoge << newl;

    return 0;
}