EqualPairs

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

            int sum = int.Parse(Console.ReadLine()) + int.Parse(Console.ReadLine());
            int maxDiff = 0;

            for(int i = 1; i < n; i++)
            {
                int tempSum = int.Parse(Console.ReadLine()) + int.Parse(Console.ReadLine());
                int diff = Math.Abs(sum - tempSum);

                if(sum != tempSum)
                {
                    sum = tempSum;
                    if(diff > maxDiff)
                    {
                        maxDiff = diff;

                    }
                }
            }

            if(maxDiff != 0)
            {
                Console.WriteLine("No, maxdiff={0}", maxDiff);
            }
            else
            {
                Console.WriteLine("Yes, value={0}", sum);
            }