#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;
}