#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pii;
#define pb push_back
#define mp make_pair
#define fi first
#define se second

int main()
{
	double n;
	cin>>n;
	double m=n*99;
	double g=(10000-n);
	cout<<fixed<<setprecision(10)<<g/(m+g)*100.0<<endl;
	return 0;
}