#include <bits/stdc++.h>
using namespace std;
int main(){
  cout << fixed << setprecision(20);
  int N;
  cin >> N;
  double R;
  cin >> R;
  double x = 100;
  double ans = 0;
  for (int i = 0; i < N; i++){
    ans += x;
    x *= 1 - R;
  }
  cout << ans << endl;
}