#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <cmath>
#include <iomanip>
#include <stack>
#include <queue>
#include <numeric>
#include <map>
#include <unordered_map>
#include <set>
#include <fstream>
#include <chrono>
#include <random>
#include <bitset>
#include <atcoder/all>
#define rep(i,n) for(int i=0;i<(n);i++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) ((int)(x).size())
#define pb push_back
using ll = long long;
using namespace std;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
ll gcd(ll a, ll b) {return b?gcd(b,a%b):a;}
ll lcm(ll a, ll b) {return a/gcd(a,b)*b;}

using ld = long double;
int main(){
  int N; cin >> N;
  ld R; cin >> R;
  vector<ld> A(N,0);
  A[0] = 100;
  ld ans = 0.0;
  rep(i,N-1){
    ld n = A[i];
    A[i] = R*n;
    ans += n;
    A[i+1] = (1-R)*n;
  }
  ans += A.back();
  cout << fixed << setprecision(20) << ans << endl;
  return 0;
}