import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;
import java.math.BigInteger;

public class FibonacciImpl extends UnicastRemoteObject implements Fibonacci {

  public FibonacciImpl() throws RemoteException {
    super();
  }
    
  public BigInteger getFibonacci(int n) throws RemoteException {
    return this.getFibonacci(new BigInteger(Long.toString(n)));  
  }
  
  public BigInteger getFibonacci(BigInteger n) throws RemoteException {  
    
    System.out.println("Calculating the " + n + "th Fibonacci number");
    BigInteger zero = new BigInteger("0");
    BigInteger one  = new BigInteger("1");
    
    if (n.equals(zero)) return one;
    if (n.equals(one)) return one; 

    BigInteger i  = one;
    BigInteger low  = one;
    BigInteger high  = one;

    while (i.compareTo(n) == -1) {
      BigInteger temp = high;
      high = high.add(low);
      low = temp; 
      i = i.add(one);
    }

    return high;

  }
}