#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;



int main() {
	int n;

	cin >> n;

	int people = 1000000;
	int per = 10000;
	int mafia = people / per * n;
	int normal = people - mafia;

	double arrested = 0.99 * mafia + 0.01 * normal;

	double ans = 0.01 * normal / arrested * 100;

	printf("%.3f\n", ans);
	return 0;
}