13TestNumbers

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

namespace ConsoleApp1
{
    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());

            int countCombinations = 0;
            int product = 0;
            int sum = 0;
            int totalSum = 0;

            for( int firstNum = n; firstNum >= 1; firstNum--)
            {
                for(int secondNum = 1; secondNum <= m; secondNum ++)
                {

                    product = firstNum * secondNum;
                        sum = 3 * product;
                        totalSum = totalSum + sum;
                    countCombinations++;
                    if (totalSum >= maxSum)
                    {
                        Console.WriteLine("{0} combinations", countCombinations);
                        Console.WriteLine("Sum: {0} >= {1}", totalSum, maxSum);
                        return;

                    }

                }

            }



                Console.WriteLine("{0} combinations", countCombinations);
                Console.WriteLine("Sum: {0}", totalSum);




        }
    }
}