using System;

namespace Sum_Of_Two_Numbers
{
    class Program
    {
        static void Main(string[] args)
        {
            int startNumber = int.Parse(Console.ReadLine());
            int endNumber = int.Parse(Console.ReadLine());
            int magicNumber = int.Parse(Console.ReadLine());

            int combos = 0;
            int sum;

            for (int x = startNumber; x <= endNumber; x++)
            {
                for (int y = startNumber; y <= endNumber; y++)
                {
                    sum = x + y;
                    combos++;
                    if (sum == magicNumber)
                    {
                        Console.WriteLine($"Combination N:{combos} ({x} + {y} = {magicNumber})");
                        break;
                    }
                }
            }

         Console.WriteLine($"{combos} combinations - neither equals {magicNumber}");


        }
    }
}