using System;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var a = new List<int>();

        Console.WriteLine(a is IEnumerable);

        Console.WriteLine(a.GetType().IsSubclassOf(typeof(IEnumerable)));

        Console.WriteLine(a.GetType().IsSubclassOf(typeof(IEnumerable<>)));

        Console.WriteLine(a.GetType().IsSubclassOf(typeof(IEnumerable<int>)));

    }

}