import java.java.rmi.Remote;
import java.java.rmi.RemoteException;

public interface Calc extends java.rmi.Remote {

  public int add(int a, int b) throws RemoteException;

  public int substract(int a, int b) throws RemoteException;

  public int multiply(int a, int b) throws RemoteException;

  public int divide(int a, int b) throws RemoteException;

}