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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Random rnd = new Random();

            int[,] tab = new int[5, 4];

            for (int x = 0; x < 5; x++)
            {

                for (int y = 0; y < 4; y++)
                {
                    if (y == 3)
                    {
                        tab[x, y] = ((tab[x, y - 3] + tab[x, y - 2]) * tab[x, y - 1]) / 2;
                    }
                    else
                    {
                        tab[x, y] = rnd.Next(1, 100);
                    }
                }
            }

            for (int x = 0; x < 5; x++)
            {

                for (int y = 0; y < 2; y++)
                {

                    Console.Write(tab[x, y] + " ");

                }
                Console.WriteLine();
            }
            Console.WriteLine();
            Console.WriteLine();

            Console.Write("Podaj pole: ");

            int zapytanie = Convert.ToInt32(Console.ReadLine());


            for (int x = 0; x < 5; x++)
            {
                if (zapytanie < tab[x, 3])
                    Console.WriteLine("Pole trapezu(" + tab[x, 0] + "," + tab[x, 1] + "," + tab[x, 2] + ") = " + tab[x, 3]);

            }
            Console.ReadKey();
        }
    }
}