using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var input = new List<FirstClass>

        {

            new FirstClass { EmployeeNo = "a", SecondClass = new List<SecondClass> { new SecondClass { Count = 5}, new SecondClass { Count = 10}}},

            new FirstClass { EmployeeNo = "b", SecondClass = new List<SecondClass> { new SecondClass { Count = 6}, new SecondClass { Count = 11}}},

            new FirstClass { EmployeeNo = "c", SecondClass = new List<SecondClass> { new SecondClass { Count = 7}, new SecondClass { Count = 12}}},

        };

        int highestCount = input.Select(x => x.SecondClass.Select(y => y.Count).Max()).Max();

        Console.WriteLine(highestCount);

        var itemWithHighestCount = input.OrderByDescending(x => x.SecondClass.Select(y => y.Count).Max()).FirstOrDefault();

        Console.WriteLine(itemWithHighestCount.EmployeeNo + " " + string.Join(", ", itemWithHighestCount.SecondClass.Select(x => "Count="+x.Count)));

    }

}

​

public class FirstClass

{

    public string EmployeeNo { get; set; }

​

    public List<SecondClass> SecondClass { get; set; }

}

​

public class SecondClass

{

    public int Count { get; set; }

}