using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var scores = new[] { 87, 56, 33, 20, 11, -10, -50 };

​

        var numnerOfScoresThatAreNotNegative = scores.Count(i => i > 0);

        Console.WriteLine(numnerOfScoresThatAreNotNegative);

    }

}