10.PairsByDifference

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

namespace _10.PairsByDifference
{
    class PairsByDifference
    {
        static void Main()
        {
            int[] numbers = Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToArray();
            int difference = int.Parse(Console.ReadLine());

            int cntr = 0;

            for (int i = 0; i < numbers.Length; i++)
            {
                for (int j = 1; j < numbers.Length; j++)
                {
                    int result = Math.Max(numbers[i], numbers[j]) - Math.Min(numbers[i], numbers[i]);

                    if (result == difference)
                    {
                        cntr++;
                    }
                }
            }

            Console.WriteLine(cntr);
        }
    }
}