using System;

​

public class Program

{

    public static int sum = 0;

    public static bool found = false;

    public void FindPair(int sum, int[] arr)

    {

        Array.Sort(arr);

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

        {

            int temp = arr[i];

            for (int j = i + 1; j < arr.Length; j++)

            {

                temp = temp + arr[j];

                if (sum - temp == temp)

                {

                    Console.WriteLine("Yes");

                    j = arr.Length;

                    found = true;

                    i = arr.Length;

                }

            }

        }

​

        if (found == false)

        {

            Console.WriteLine("No");

        }

    }

​

    public static void Main()

    {

        int[] arr = new int[]{1, 5, 11, 5};

        Program obj = new Program();

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

        {

            sum = sum + arr[i];

        }

        obj.FindPair(sum, arr);

    }

}