using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int person = int.Parse(Console.ReadLine());

            int mafia = person * 100;
            int citizen = 1000000 - mafia;

            double ans = (citizen * 0.01 / (mafia * 0.99 + citizen * 0.01)) * 100;
            Console.WriteLine(ans);
        }
    }
}