TribonacciTriangle

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

namespace TribonacciTriangle
{
    class TribonacciTriangle
    {
        static void Main(string[] args)
        {
            long numOne = long.Parse(Console.ReadLine());
            long numTwo = long.Parse(Console.ReadLine());
            long numThree = long.Parse(Console.ReadLine());
            byte lines = byte.Parse(Console.ReadLine());
            if(lines == 2)
            {
                Console.WriteLine(numOne);
                Console.WriteLine(numTwo+ " " +numThree);
            }
            else
            {
                int elementsOnLine = 3;
                Console.WriteLine(numOne);
                Console.WriteLine(numTwo + " " + numThree);
                for (int i = 0 i <= lines-3;i++ )
                {
                    int elementPosition = 1;

                    while(elementPosition <= elementsOnLine)
                    {
                        long nextNum = numOne + numTwo + numThree;
                        numOne = numTwo;
                        numTwo = numThree;
                        numThree = nextNum;
                        Console.Write(nextNum);
                        elementPosition++;
                        if(elementPosition == elementsOnLine + 1)
                        {
                            break;
                        }
                        else
                        {
                            Console.Write(" ");
                        }
                    }
                    Console.WriteLine();
                    elementsOnLine++;
                }
            }
        }
    }
}