#include <iostream>
#include <iomanip>

using namespace std;

int main() {
	int n;
	cin >> n;
	double pDetector = 0.99;
	double pMember = (double)n / 10000.;
	double pNotMemberAndDetectedAsMember 
		= (1. - pMember) * (1. - pDetector);
	double pDetectedAsMember 
		= pMember * pDetector + (1. - pMember) * (1. - pDetector);
	double p = pNotMemberAndDetectedAsMember / pDetectedAsMember;
	cout << fixed << setprecision(7) << (p * 100.) << endl;
	return 0;
}