using System;

class Program
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int even = 0;
        int odd = 0;
        for (int i = 1; i <= n; i++)
        {
            if (i % 2 == 0)
            {
                int number = int.Parse(Console.ReadLine());
                even += number;
            }
            else
            {
                int number = int.Parse(Console.ReadLine());
                odd += number;
            }
        }
        if (even == odd)
        {
            Console.WriteLine("Yes, sum = {0}", even);
        }
        else
        {
            Console.WriteLine("No, diff = {0}", Math.Abs(even - odd));
        }
    }
}