#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;

int main(void){
	double n;
	cin >> n;
	n *= 100;

	double kousein = n * 0.99;
	double gonin = (1000000-n) * 0.01;
	cout << fixed << setprecision(10) << gonin/(kousein+gonin)*100 << endl;
	return 0;
}