using System;

public class Program

{

    public static void Main()

    {

        int ef = 40;

        var efPoints = ef switch {

                >= 40 => 0,

                >= 35 => 2,

                >= 30 => 3,

                >= 25 => 5,

                >= 20 => 6,                 

                _ => 7

        };

        Console.WriteLine(efPoints);

    }

}