Test Numbers

using System;

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

            var counter = 0;
            var sum = 0;

            for (int i = n; i >= 1; i--)
            {
                for (int j = 1; j <= m; j++)
                {
                    counter++;
                    sum += 3 * (i * j);

                    if (sum >= maxSum)
                    {
                        Console.WriteLine($"{counter} combinations");
                        Console.WriteLine($"Sum: {sum} >= {maxSum}");
                        Environment.Exit(0);
                    }
                }
            }
            Console.WriteLine($"{counter} combinations");
            Console.WriteLine($"Sum: {sum}");
        }
    }
}