using System;

public class Program

{

    public static void Main()

    {

        var hits = 0 ;

        var rnd = new Random();

        for(var i=0;i< 100000;i++){

            var next = rnd.NextDouble();

            if(next < 0.1) hits++;

        }

        var final = hits/100000.0;

        final.Dump();

    }

}