namespace Couples
{
    using System;

    using static System.Console;

    class Program
    {
        private static void Main(string[] args)
        {
            int n = int.Parse(ReadLine());

            double a = double.Parse(ReadLine());
            double b = double.Parse(ReadLine());

            double value = a + b;
            double maxDiff = double.MinValue;
            bool areEqual = true;
            double previousValue = value;

            for (int i = 0; i < n - 1; i++)
            {
                a = double.Parse(ReadLine());
                b = double.Parse(ReadLine());
                double currentValue = a + b;

                if (areEqual && Math.Abs((a + b) - value) > 0.0001)
                {
                    areEqual = false;
                }

                double currentDiff = Math.Abs(currentValue - previousValue);
                if (currentDiff - maxDiff > 0.0001)
                {
                    maxDiff = currentDiff;
                }

                previousValue = currentValue;
            }

            if (areEqual)
            {
                WriteLine($"Yes, value={value}");
            }
            else
            {
                WriteLine($"No, maxdiff={maxDiff}");
            }
        }
    }
}