using System.Linq;

using System.Collections.Generic;

​

public class Pair  

{

    public int Height { get; set; }

    public int Width { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        var p = new List<Pair>();

        p.Add(new Pair() {Height = 18, Width = 22});

        p.Add(new Pair() {Height = 44, Width = 24});

        p.Add(new Pair() {Height = 3, Width = 64});

        p.Add(new Pair() {Height = 15, Width = 34});

        var max = p.Max(pair => pair.Height);

        System.Console.WriteLine(max);

    }

}