public class Program

{

    public class Student

    {

        public string clas;

        public string id;//nomer v klasa

        public string name;

        private double dBEL,dForign,

    dMath,dPhys,dChem,dBio;

        private double average;

        public double DBEL

        {

            set { this.dBEL = value;}

            get { return this.dBEL;}

        }

    }

}