import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args){
        // TODO 自動生成されたメソッド・スタブ
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        double a = n/10000D;
        double ok = a*0.99;
        double miss = (1-a)*0.01;
        System.out.println(miss/(miss+ok)*100);
    }
}