TestNumbers

using System;

namespace TestNumbers
{
    class TestNumbers
    {
        static void Main(string[] args)
        {
            var firstLine = int.Parse(Console.ReadLine());
            var secondLine = int.Parse(Console.ReadLine());
            var thirdLine = int.Parse(Console.ReadLine());
            var result = 0;
            var combinations = 0;
            for (int i = firstLine; i >= 1; i--)
            {
                for (int j = 1; j <= secondLine; j++)
                {
                    result += 3 * (i * j);
                    combinations++;
                    if (result >= thirdLine)
                    {
                        Console.WriteLine($"{combinations} combinations");
                        Console.WriteLine($"Sum: {result} >= {thirdLine}");
                        return;
                    }
                }
            }
            Console.WriteLine($"{combinations} combinations");
            Console.WriteLine($"Sum: {result}");
        }
    }
}