#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <cmath>
#include <climits>
#include <iomanip>
#include <set>
#include <map>
using namespace std;
typedef long long ll;
int main(){
    ll n;
    cin >> n;
    double tt = n * 100 * 0.99;
    double tf = n * 100 * 0.01;
    double ff = (10000 - n) * 100 * 0.99;
    double ft = (10000 - n) * 100 * 0.01;
    
    cout << fixed << setprecision(10) << (double)(100 * ft / (tt + ft)) << endl;
}