#include<bits/stdc++.h>
using lint=long long;
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 x=10'000,y;std::cin>>y;x-=y;
    x*=0.01,y*=0.99;
    std::cout<<100*x/(x+y)<<'\n';
}