using System;

public class BankAccount {

   private double interestRate;
   private string owner;
   private decimal balance;
   private long accountNumber;

   private static long nextAccountNumber = 0;

   public BankAccount(string owner) {
      nextAccountNumber++;
      this.accountNumber = nextAccountNumber;
      this.interestRate = 0.0;
      this.owner = owner; 
      this.balance = 0.0M;
   }

   public BankAccount(string owner, double interestRate) {
      nextAccountNumber++;
      this.accountNumber = nextAccountNumber;
      this.interestRate = interestRate;
      this.owner = owner; 
      this.balance = 0.0M;
   }   

   public decimal Balance () {
      return balance;
   }

   public void Withdraw (decimal amount) {
      balance -= amount;
   }

   public void Deposit (decimal amount) {
      balance += amount;
   }

   public void AddInterests() {
      balance = balance + balance * (decimal)interestRate;
   }    

   public override string ToString() {
      return owner + "'s account, no. " + accountNumber + " holds " +
            + balance + " kroner";
   }
}