using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

public class Program

{

     private static readonly Func<long, int> DefaultDelayInSecondsByAttemptFunc = attempt =>

        {

            var random = new Random();

            return (int)Math.Round(

                Math.Pow(attempt - 1, 4) + 15 + random.Next(30) * attempt);

        };

    public static void Main()

    {   

        for(int i = 1; i<6; i++){

                    Console.WriteLine(DefaultDelayInSecondsByAttemptFunc(i));

​

        }

    }

}