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

int main(){
	int n;
	cin >> n;
	long double x = 1.0 - n / 10000.0, y = 0.01, z = n / 10000.0 * 0.99 + x * y;
	cout << x * y / z * 100 << endl;
	return 0;
}