#include <bits/stdc++.h>
using namespace std;
#include <atcoder/lazysegtree>
using namespace atcoder;

int op(int a, int b) {return max(a, b);}
int e() {return 0;}
int mapping(int f, int x) {return f + x;}
int composition(int f, int g) {return f + g;}
int id() {return 0;}

using ll = long long;
#define rep(i, n) for(int i = 0; i < n; i++)

int main() {
	int N;
	cin >> N;
	int all = 1000000;
	double c = all / 10000 * N;
	double d = all - c;
	double e = d / 100;
	double f = e + c * 99 / 100;
	cout << fixed << setprecision(12) << e * 100 / f << endl;
}