#include <bits/stdc++.h>
using namespace std;

int main() {
    int N;
    cin >> N;
    cout << fixed << setprecision(10) << 100.0 * (1.0 - 1.0 * N / 10000 * 0.99 / ((N * 0.99 + (10000 - N) * 0.01) / 10000)) << endl;
}