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

namespace ConsoleApplication1
{
    class Program
    {
        static bool Rishoni(int num)
        {
            for (int i = 2; i <= Math.Sqrt(num); i++)
                if (num % i == 0)
                    return false;
            return true;
        }
        static void Print(int[] a)
        {
            for (int i = 0; i < a.Length; i++)
                Console.Write(a[i] + " ");
            Console.WriteLine();
        }
        static void Main(string[] args)
        {
            DateTime st = DateTime.Now;
            int[] primes = new int[15];
            int num = 2;
            bool x;
            for (int i = 0; i < primes.Length; i++)
            {
                while (!Rishoni(num))
                    num++;
                primes[i] = num;
                num++;
            }
            for (int i = 4; i <= 50; i += 2)
            {
                x = false;
                for (int k = 0; k < primes.Length; k++)
                {
                    for (int j = 0; j < primes.Length; j++)
                    {
                        if (primes[k] + primes[j] == i)
                        {
                            Console.WriteLine(i + " = " + primes[k] + " + " + primes[j]);
                            x = true;
                        }
                        if (x)
                            break;
                    }
                    if (x)
                        break;
                }
            }
            Console.WriteLine(DateTime.Now.Subtract(st));
        }
    }
}