#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
using namespace std;
int main() {
  cin.tie(0); cout.tie(0);
  ios::sync_with_stdio(false);
  int N;
  cin >> N;
  double R;
  cin >> R;
  cout << fixed << setprecision(12) << (1 - pow(1 - R, N)) / R * 100 << '\n';
  return 0;
}