using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

       int[] nums = {2, 4, 3, 4, 6, 7, 1 };

        for(int i=0;i<nums.Length;i++)

        {

            for(int j=0;j<nums.Length;j++)

            {

                if(nums[i]+ nums[j]==7)

                {

                    Console.WriteLine(string.Format("Combinations for sum 7 from input is {0} {1}", nums[i],nums[j]));

                }

​

            }

        }

    }

}