using System;
class HalfSumElement
{
    static void Main(string[] args)
    {
        {
            var n = int.Parse(Console.ReadLine());
            var sum = 0;
            var num = 0;
          int max = int.MinValue;
            for (int i = 1; i <= n; i++)
            {
                num = int.Parse(Console.ReadLine());
                if (num > max)
                {
                  max = num;
                }
                sum += num;
            }
          sum = sum - max;
            if (sum == max)
                Console.WriteLine("Yes sum = " + sum);
            else
                Console.WriteLine("No Diff = " + Math.Abs(sum-max));
        }
    }
}