#include<bits/stdc++.h>
using lint=long long;
using real=long double;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    double p,q;std::cin>>p>>q;
    std::cout<<p*q/((100-p)*(100-q)+p*q)*100<<'\n';
}