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

int main(void){
  double n, r;
  cin >> n >> r;
  vector<double> bank(n + 1, 0);
  bank[1] = 100;
  double sum = 0;
  for (int i = 1; i <= n; i++) {
    if (i != n) bank[i + 1] = (1 - r) * bank[i];
    sum += bank[i];
  }
  cout << fixed << setprecision(10) << sum << endl;
  return 0;
}