using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var n = 20;

        Console.Write(string.Join(", ", Enumerable.Range(1, n).Select(x => string.Concat(new List<(int, string)>{(3, "Fizz"), (5, "Buzz")}.Where(t => x % t.Item1 == 0).Select(t => t.Item2)) is var s && s != "" ? s : x.ToString())));

    }   

​

}