Game of Numbers - for loops

using System;

namespace P13GameOfNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int m = int.Parse(Console.ReadLine());
            int magicNum = int.Parse(Console.ReadLine());

            int combinations = 0;
            var lastComb = string.Empty;


            for (int k = n; k <= m; k++)
            {
                for (int j = n; j <= m; j++)
                {
                    combinations++;
                    if (k + j== magicNum && k > j)
                    {
                        lastComb = $"Number found! {k} + {j} = {magicNum}";
                    }
                }
            }
            if (lastComb == string.Empty)
            {
                Console.WriteLine($"{combinations} combinations - neither equals {magicNum}");
            }
            else
            {
                Console.WriteLine(lastComb);
            }
        }
    }
}