EqualPairs

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

namespace Equal_Pairs
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            var first = int.Parse(Console.ReadLine());
            var second = int.Parse(Console.ReadLine());
            var sum = first + second;
            var maxDiff = int.MinValue;

            for (int i = 0; i < n - 1; i++)
            {
                var a = int.Parse(Console.ReadLine());
                var b = int.Parse(Console.ReadLine());
                if (sum != a + b)
                {
                    var diff = Math.Abs(sum - (a + b));
                    if (maxDiff < diff)
                    {
                        maxDiff = diff;
                    }
                    sum = a + b;
                }
            }
            if (maxDiff == int.MinValue)
            {
                Console.WriteLine($"Yes, value={sum}");
            }
            else
            {
                Console.WriteLine($"No, maxdiff={maxDiff}");
            }
        }
    }
}