#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (int)n; ++i)
using namespace std;
using ll = long long;

int main(){
   ios::sync_with_stdio(false);
   cin.tie(nullptr);

   int n;
   cin >> n;
   double r;
   cin >> r;
   double x = 100;
   double ans = x;
   rep(i,n-1){
      x *= (1-r);
      ans += x;
   }
   cout << fixed << setprecision(20) << ans << endl;
}