#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

int main() {
    
    double N;
    cin >> N;
    
    double A = 10000 - N;
    double B= 99*N;
    
    printf( "%f", A*100 / (A+B) );
    
    
    return 0;
}