#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
#define fr(i, a, b) for (int i = (a); i < (b); i++)
#define all(c) (c).begin(), (c).end()
using namespace std;
typedef long long ll;
const ll inf = 1e9;
const ll mod = 1e9 + 7;

int main() {
    double N;
    cin >> N;

    double E = 0;

    E += 0.01 * (1000000 - N * 100);
    double X = (1000000 - N * 100) * 0.01 + 0.99 * N * 100;

    printf("%.15f\n", E / X * 100);
}