class DepositAccount extends Account
{
 private boolean newmonth=true;
 private double interest;

 public DepositAccount(int sum,double interest)
 {
  super(sum);
  this.interest=interest;
 }

 public boolean withdraw(int sum)
 {
  if(!newmonth)
     return false;
  else if(super.withdraw(sum))
     {
      newmonth=false;
      return true;
     }
  else
     return false;
 }

 public void update()
 {
  deposit((int)(balance()*interest));
  newmonth=true;
 }

 public void setInterest(double newInterest)
 {
  interest=newInterest;
 }
}