using System;
using System.Collections.Generic;

class Program
{
    static string InputPattern = "Input4";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("100");
            //50
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("2500");
            //2.94117647058824
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("1");
            //99.0196078431373
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    //No.221 犯罪都市
    static void Main()
    {
        List<string> InputList = GetInputList();
        decimal N = decimal.Parse(InputList[0]);

        //PA=マフィアで、判定器がマフィアと判定
        //PB=マフィアでなくて、判定器がマフィアと判定
        decimal PA = N / 10000M * 0.99M;
        decimal PB = (10000M - N) / 10000M * 0.01M;

        Console.WriteLine(100M * PB / (PA + PB));
    }
}