#include <iostream>
#include <string>
#include <string.h>
#include <vector>
#include <algorithm>
#include <sstream>
#include <set>
#include <queue>
#include <tuple>

using namespace std;

#define For(i,a,n)	for(int i = a;i < n;i++)
#define rep(i,n)	For(i,0,n)
#define clr(n)		memset(n,0,sizeof n)
#define all(n)		(n).begin(),(n).end()

typedef pair<int, int> P;
typedef tuple<int, int, int> T;
typedef long long ll;

const ll INF = 1e9;
int dx[4] = { 0, 1, 0, -1 }, dy[4] = { 1, 0, -1, 0 };
bool cheak(int x, int y, int mx, int my){
	return x >= 0 && y >= 0 && x < mx &&  y < my;
}
int main()
{
	double n;
	cin >> n;

	double t = 1000000.0 / 10000.0 * n;

	double q = 0;
	q += (1000000.0 - double(t)) * 0.01;
	double sum = t + q - t * 0.01;

	cout << q / sum * 100 << endl;
	return 0;
}