school/School/Program.cs

namespace School
{
    internal class Program
    {
        static void Main(string[] args)
        {
            DerivedClass derivedClass = new DerivedClass();
            derivedClass.CountSkip(5);
            derivedClass.AvgRating(5);
            derivedClass.ReadDiary();
            derivedClass.Eror();
        }
    }
}