class PrimaryStudent extends Student{
    protected int grade;

    public PrimaryStudent(){}

    public PrimaryStudent(String name, int age, int score, int grade){
        super(name,age,score);
        this.grade = grade;
    }

    public void setGrade(int grade){
        this.grade = grade;
    }
    
    public int getGrade(){
       return this.grade;
   }
}