Equal_Pairs

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

namespace LiveDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int firstSum = 0;
            int secondSum = 0;
            int i = 0;
            int maxDifference = 0;
            while(i<n)
            {
                secondSum = firstSum;
                int num = int.Parse(Console.ReadLine());
                int num2 = int.Parse(Console.ReadLine());
                firstSum = num + num2;
                if (i>0)
                {
                    if(firstSum!=secondSum)
                    {
                        maxDifference = Math.Abs(firstSum - secondSum);
                    }
                }
                i++;
            }
            if(firstSum==secondSum||n==1)
            {
                Console.WriteLine("Yes, value={0}",firstSum);
            }
            else
            {
                Console.WriteLine("No, maxdiff={0}",maxDifference);
            }
        }
    }
}