#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;

	long double a, b, c;
	a = 1.0 - n / 10000.0;
	b = 0.01;
	c = n / 10000.0 * 0.99 + (1.0 - n / 10000.0) * 0.01;
	cout << a * b / c * 100 << endl;
}