#include <bits/stdc++.h>

using namespace std;
using ld = long double;

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

    int N;
    cin >> N;
    ld R, ans=0, x;
    cin >> R;
    vector<ld> c(N+1);
    c[0] = 100;
    for (int i=0; i<N; i++){
        ans += c[i];
        c[i+1] = (1.l-R)*c[i];
    }

    cout << setprecision(18) << ans << endl;

    return 0;
}