#include<bits/stdc++.h> using namespace std; int main(){ int N; double R; cin>>N>>R; vector<double> bank(N); double bill=100.00; double ans=0.00; for(int i=1;i<N;i++){ bank[i]=(1-R)*bill; bill=bank[i]; ans+=bill; } cout<<fixed<<setprecision(27); cout<<ans+100<<endl; }