More.Exercises.Nested.Loops-13.Prime.Pairs

using System;

namespace _13.PrimePairs
{
    class Program
    {
        static void Main(string[] args)
        {
            int startFirstCouple = int.Parse(Console.ReadLine());
            int startSecondCouple = int.Parse(Console.ReadLine());
            int diffFirstCouple = int.Parse(Console.ReadLine());
            int diffSecondCouple = int.Parse(Console.ReadLine());

            int endFirstCouple = startFirstCouple+diffFirstCouple;
            int endSecondCouple = startSecondCouple+diffSecondCouple;

            for (int i = startFirstCouple; i <=endFirstCouple; i++)
            {

                for (int j = startSecondCouple; j <=endSecondCouple; j++)
                {
                    bool primeFirst = true;

                    for (int primeNumFirst = 2; primeNumFirst <= i/2; primeNumFirst++)
                    {
                        if (i % primeNumFirst == 0)
                        {
                            primeFirst = false;

                        }
                    }

                    bool primeSecond = true;

                    for (int primeNumSecond = 2; primeNumSecond <= j/2; primeNumSecond++)
                    {
                        if (j % primeNumSecond == 0)
                        {
                            primeSecond = false;

                        }
                    }
                   if (primeFirst && primeSecond)
                    {
                        Console.WriteLine($"{i}{j}");
                    }

                }
            }
        }
    }
}