#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define X first
#define Y second
#define SZ(a) ((int)a.size())
#define ALL(v) v.begin(), v.end()
#define pb push_back

int main() {
    ios::sync_with_stdio(0), cin.tie(0);
    int n;
    double r, b = 100, ans = 0;
    cin >> n >> r;
    for (int i = 1; i <= n; ++i) {
        ans += b;
        b = b * (1 - r);
    }
    cout << fixed << setprecision(20) << ans << "\n";
}