class SavingsAccount {
  static int annualInterestRate;
  private double savingsBalance;

  SavingsAccount(double s) {
    savingsBalance = s;
  }

  static void modifyInterestRate(int x) {
    annualInterestRate = x;
  }

  void calculateMonthlyInterest() {
    double d = (savingsBalance * annualInterestRate) / 12;
    savingsBalance = savingsBalance + d;
  }

  void display() {
    System.out.println(savingsBalance);
  }
}

public class Program5 {
  public static void main(String[] args) {
    SavingsAccount saver1 = new SavingsAccount(2000);
    SavingsAccount saver2 = new SavingsAccount(3000);

    SavingsAccount.modifyInterestRate(4);
    saver1.calculateMonthlyInterest();
    saver2.calculateMonthlyInterest();
    saver1.display();
    saver2.display();

    SavingsAccount.modifyInterestRate(5);
    saver1.calculateMonthlyInterest();
    saver2.calculateMonthlyInterest();
    saver1.display();
    saver2.display();
  }
}