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

namespace EqualNumbers
{
    class Program
    {
        static void Main(string[] args)
        {
            var count = int.Parse(Console.ReadLine());
            double previousPairSum = 0;
            double currentPairSum = 0;
            double difference = 0;
            double biggestdifference = 1;
            for (int i = 1; i <= count; i++)
            {
                currentPairSum = previousPairSum;
                var num1 = int.Parse(Console.ReadLine());
                var num2 = int.Parse(Console.ReadLine());
                previousPairSum = num1 + num2;
                biggestdifference = Math.Abs(previousPairSum - currentPairSum);
                if (biggestdifference > difference & i >= 2)
                {
                    difference = biggestdifference;
                }
            }
            if (difference == 0)
            {
                Console.WriteLine("Yes value = {0}", previousPairSum);
            }
            else
            {
                Console.WriteLine("No maxdiff = {0}", difference);
            }
        }
    }
}