using System;
using System.Collections.Generic;

public class Person{
private string name1;
private string name2;
private System.DateTime birth;

public Person()
{
name1="polya";
name2="ivanova";
birth=new DateTime(1999,11,22);
}

public Person(string n1,string n2,DateTime b)
{
this.name1=n1;
this.name2=n2;
this.birth=b;
}
 /////////////////
public string Name
{
get
{
return name1;
}
set {
name1=value;
}

}
public string SecondName
{
get
{
return name2;
}
set {
name2=value;
}

}
    ////////////
public DateTime Birth
{
get
{
return birth;
}
set {
birth=value;
}

}
public int Year
{
get
{
return birth.Year;
}
set {

birth=new DateTime(value,birth.Month,birth.Day);
}
}


    /////////////
    public override string ToString()
{

    return Name+SecondName+Birth.ToString();
}



public virtual  string ToShortString()
{

    return Name+SecondName;
}
}



////////////////////////////
public enum Education {Specialist, Вachelor, SecondEducation}




public class Exam
{
    string subject;
    int rate;
    DateTime examday;
    ///////////////
    public string Subject
{
get
{
return subject;
}
set {
subject=value;
}

}
public int Rate
{
get
{
return rate;
}
set {
rate=value;
}

}
    ////////////
public DateTime Examday
{
get
{
return examday;
}
set {
examday=value;
}
}

    public Exam()
{
subject="pract";
rate=5;
examday=new DateTime(2017,05,30);
}

public Exam(string sub,int r,DateTime ed)
{
this.subject=sub;
this.rate=r;
this.examday=ed;
}
public override string  ToString()
{
    return Subject+Rate.ToString()+Examday.ToString();
}

}
///////////////
//////////////
public class Student
{
    private Person pers;
    private Education fo;
    private int gruppa;
    private List<Exam> exams;


    /////


     public Person Pers
{
get
{
return pers;
}
set {
pers=value;
}

}
public Education Fo
{
get
{
return fo;
}
set {
fo=value;
}

}





       List<Exam> Exams
        {
            get
            {
                return exams;
            }
            set
            {
                exams=value;

            }
        }


    ////////

    private double sr=0;
    public double Sr
    {
        get
        {
            int l=exams.Count;
            for(int i=1;i<l;i++)
            {
                sr+=Exams[i].Rate;
            }
            sr/=l;
            return sr;
        }
    }

    ///////////

    public bool this[Education educ ]
    {
        get
        {

            return educ==fo;
        }

    }





   public void AddExams ( params Exam [] exames)
    {
        this.exams.AddRange(exames);
    }




    public override string ToString()
{
       string s=pers.ToString()+fo.ToString()+gruppa.ToString();
        for(int i=1;i<exams.Count;i++)
            s+=Exams[i].Subject;

    return s;
}

	public virtual string ToShortString()
	{
		return pers.ToString()+fo.ToString()+gruppa.ToString()+Sr.ToString();
	}


    ////////////
public int Gruppa
{
get
{
return gruppa;
}
set {
gruppa=value;
}
}

    public Student()
{
pers.Birth=new DateTime(1999,11,22);

fo=Education.Вachelor;
gruppa=862;
}





public Student(Person per,Education edu,int g)
{
this.pers=new Person (per.Name,per.SecondName,per.Birth);
this.fo=edu;
this.gruppa=g;
}












}

public class Program

{
public static void Main()
{
	Student stud=new Student();
	Console.WriteLine(stud.ToShortString());
	DateTime d=new DateTime(1999,11,22);
	//List<Exam> ex=new List<Exam>();
	Console.WriteLine(Education.Specialist+" "+stud[Education.Specialist]);
	Console.WriteLine(Education.Вachelor+" "+stud[Education.Вachelor]);
	Console.WriteLine(Education.SecondEducation+" "+stud[Education.SecondEducation]);
	Console.WriteLine(Education.Specialist+" "+stud[Education.Specialist]);




	stud.AddExams(new Exam("fdhhd",5,d));
	Console.WriteLine(stud.ToString());
	stud= new Student(new Person("polya","ivanova",d),Education.Specialist,862);


Person per= new Person("polya","ivanova",d);
per.Year=2000;
Console.WriteLine(per.Year);
    Console.WriteLine(per.ToString());
    Console.WriteLine(per.ToShortString());
    Education edu=Education.Вachelor;
    Console.WriteLine(edu);


}
}