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

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int N;
    double R;
    cin >> N >> R;
    R = 1 - R;

    double ans = 0, cur = 100;
    rep(i, N) {
        ans += cur;
        cur *= R;
    }
    printf("%.20f\n", ans);

    return 0;
}