using System;

public class Program

{

    public static void Main()

    {

        int n=int.Parse(Console.ReadLine());

        int oddSum=0;

        int evenSum=0;

        for (int i=1; i<=n;i++)

        {

            if(i%2!=0)

            {

                oddSum=oddSum+int.Parse(Console.ReadLine());

            }

            else

            {

                evenSum=evenSum+int.Parse(Console.ReadLine());

            }

        }

        if (evenSum==oddSum)

        {

        Console.WriteLine("Yes, sum={0}", oddSum);

        }

        else

        {

            int diff=Math.Abs(oddSum-evenSum);

         Console.WriteLine("No, diff={1}",diff);

        }

    }

}