#include <bits/stdc++.h>
using ll = long long;
using ld = long double;
template <typename T>
constexpr T MOD() { return 1000000007; }
template <typename T>
constexpr T INF() { return std::numeric_limits<T>::max() / 16; }
int main()
{
    ld P, Q;
    std::cin >> P >> Q;
    std::cout << std::fixed << std::setprecision(20);
    if (P != 100 and P != 0 and Q != 100 and Q != 0) {
        P = 100 / P - 1, Q = 100 / Q - 1;
        std::cout << 100 / (1 + P * Q) << std::endl;
    } else if (P == 100 or Q == 100) {
        std::cout << 100 << std::endl;
    } else if (P == 0 or Q == 0) {
        std::cout << 0 << std::endl;
    } else {
    }
    return 0;
}