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

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);  
	
	int n;
	cin >> n;
	int x = n * 100;
	int y = 1000000 - x;
	double yy = 1.0 * y / 100;
	double xx = 1.0 * x * 99 / 100;
	cout << setprecision(5) << fixed << 100 * yy / (xx + yy) << endl;
	return 0;
}