#include <bits/stdc++.h>
using namespace std;

int main() {
int N;
double R;
cin >> N >>R;
double ans=0;
double beef[N]={0};
beef[0]=100;
for(int i=0;i<N;i++){
  ans+=beef[i];
  if(i+1<N) {
    beef[i+1] += (1-R)*beef[i];
    beef[i] -= (1-R)*beef[i];
    
 }
}
cout << fixed << setprecision(10) << ans <<endl;
}