Tribonacci

using System;
using System.Numerics;

class Program
{
    static void Main()
    {
        int stopper = 1;
        BigInteger firstn = BigInteger.Parse(Console.ReadLine());
        BigInteger secondn = BigInteger.Parse(Console.ReadLine());
        BigInteger thirdn = BigInteger.Parse(Console.ReadLine());
        BigInteger T = firstn;
        int linesn = int.Parse(Console.ReadLine());
        Console.WriteLine(firstn);
        Console.WriteLine(secondn + " " + thirdn);
        for (int i = 2; i < linesn; i++)
        {

            for (int j = 2; j <= i + 2; j++)
            {
                T = firstn + secondn + thirdn;
                Console.Write(T + " ");
                firstn = secondn;
                secondn = thirdn;
                thirdn = T;
            }
            Console.WriteLine();
        }
    }
}