using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var scores = new[] {87, 56, 56, 33, 33, 20, 11, 11};

​

        var distinctScores = scores.Distinct();

        foreach (var score in distinctScores)

        {

            Console.WriteLine(score);

        }

    }

}