using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

public class Program

{

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

    {

      Random random = new Random();

      return (int) Math.Round(Math.Pow((double) (attempt - 1L), 4.0) + 15.0 + (double) ((long) random.Next(30) * attempt));

    });

    public static void Main()

    {   

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

                    Console.WriteLine(DefaultDelayInSecondsByAttemptFunc(i));

​

        }

    }

}