C# 20/100

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

namespace NumberGenerator
{
    class NumberGenerator
    {
        static void Main(string[] args)
        {
            int m = int.Parse(Console.ReadLine());
            int n = int.Parse(Console.ReadLine());
            int l = int.Parse(Console.ReadLine());
            int specialNumber = int.Parse(Console.ReadLine());
            int controlNumber = int.Parse(Console.ReadLine());
            bool result1;
            bool result2 = false;
            for (int i = m; i >= 1; i--)
            {
                for (int j = n; j >= 1; j--)
                {
                    for (int k = l; k >= 1; k--)
                    {
                        int sum = i + j + k;
                        result1 = false;
                        if (sum % 3 == 0 && !result1)
                        {
                            specialNumber += 5;
                            result1 = true;
                        }
                        else if (sum % 10 == 5 && !result1)
                        {
                            specialNumber -= 2;
                            result1 = true;
                        }
                        else if (sum % 2 == 0 && !result1)
                        {
                            specialNumber *= 2;
                        }
                        if (specialNumber >= controlNumber)
                        {
                            Console.WriteLine("Yes! Control number was reached! Current special number is "
                                + specialNumber + ".");
                            result2 = true;
                            break;
                        }
                    }
                    if (result2)
                    {
                        break;
                    }

                }
                if (result2)
                {
                    break;
                }
            }
            if (!result2)
            {
                Console.WriteLine("No! {0} is the last reached special number.", specialNumber);
            }

        }
    }

}