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

namespace EvenSum
{
    class Program
    {
        static void Main(string[] args)
        {

            var n = int.Parse(Console.ReadLine());
            int even = 0;
            int odd = 0;
            for (int i = 1; i <= n; i++) // should be to n
            {
                var number = int.Parse(Console.ReadLine());

                if (i % 2 == 0)
                {
                    even = even + number;

                }
                else if (i % 2 != 0)
                {
                    odd = odd + number;
                }

            }
            int diff = Math.Abs(even - odd); // should  be "-"
            if (even == odd)
            {
                Console.WriteLine("Yes, sum={0}", even);
            }
            else // no need to be "if (even != odd)", only else is OK
            {
                Console.WriteLine("No, diff={0} ", diff);
            }
        }

    }
}