Problem-12-Zero-Subset

using System;

namespace _12_Zero_Subset
{
    class Program
    {
        static void Main()
        {
            int[] fiveNumbers = new int[5];
            int n = fiveNumbers.Length;
            string output = "";

            for (int i = 0; i < n; i++)
            {
                fiveNumbers[i] = int.Parse(Console.ReadLine());
            }

            int sum = 0;
            int result = 0;

            //check if element is 0:

            for (int i = 0; i < n; i++)
            {
                if (fiveNumbers[i] == 0)
                {
                    Console.WriteLine(fiveNumbers[i]);
                    result ++;
                }
            }

            //check for sum of every two numbers:

            for (int i = 0; i < n; i++)
            {
                for (int k = (i + 1); k < n; k++)
                {
                    if ((fiveNumbers[i] + fiveNumbers[k]) == sum)
                    {
                        Console.WriteLine("{0} + {1} = 0", fiveNumbers[i], fiveNumbers[k]);
                        result ++;
                    }
                }
            }

            //check for sum of every three numbers:
            for (int i = 0; i < n; i++)
            {
                for (int k = (i+1); k < n; k++)
                {
                    for (int p = (k+1); p < n; p++)
                    {
                        if ((fiveNumbers[i] + fiveNumbers[k] + fiveNumbers[p]) == sum)
                        {
                            Console.WriteLine("{0} + {1} + {2} = 0", fiveNumbers[i], fiveNumbers[k], fiveNumbers[p]);
                            result ++;
                        }
                    }
                }
            }

            //check for sum of every four elements:
            for (int i = 0; i < n; i++)
            {
             for (int k = (i+1); k < n; k++)
            {
                 for (int p = (k+1); p < n; p++)
            {
                      for (int q = (p+1); q < n; q++)
            {
                          if ((fiveNumbers[i] + fiveNumbers[k] + fiveNumbers[p]+fiveNumbers[q]) == sum)
                          {
                              Console.WriteLine("{0} + {1} + {2} + {3} = 0", fiveNumbers[i], fiveNumbers[k], fiveNumbers[p], fiveNumbers[q]);
                              result ++;
                          }
            }
            }
            }
            }

            //check for sum of all five element:

            int allFive = 0;
            for (int i = 0; i < n; i++) allFive = allFive + fiveNumbers[i];
            if (allFive == sum)
                {
                    for (int i = 0; i < n; i++) output = output + " " + Convert.ToString(fiveNumbers[i]) + " +";
                    output = output.TrimStart(' ');
                    output = output.TrimEnd('+');
                    Console.Write(output);
                    Console.Write(" = 0");
                    Console.WriteLine();
                    result ++;
                }

            if (result == 0) Console.WriteLine("no zero subset");
        }
    }
}