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

int main(){
  ll n;
  cin>>n;
  ld r;
  cin>>r;
  vector<ld> cnt(n+1,0.0);
  ld now=100.0;
  for(ll i=1;i<=n;i++){
    cnt[i]+=now;
    now=(1.0-r)*now;
  }
  ld ans=0.0;
  for(ll i=1;i<=n;i++){
    ans+=cnt[i];
  }
  cout<<fixed<<setprecision(15);
  cout<<ans<<endl;
}