Java Loan Amortization

Please what could be wrong with my code. it is an iteration approach to: The monthly payment for a given loan pays the principal and the interest. The monthly interest is computed by multiplying the monthly interest rate and the balance (the remaining principal).
The principal paid for the month is therefore the monthly payment minus the
monthly interest. Write a program that lets the user enter the loan amount, number of years, and interest rate and displays the amortization schedule for the loan.
However, i keep getting NaN just to calculate monthly payment.code is as follow:

import java.util.Scanner;
public class Amortization {

public static void main(String[] args) {
//create Scanner 
Scanner s = new  Scanner(System.in);
//prompt Users  for  input
System.out.print("Enter loan Amount:");
int  loanAmount = s.nextInt();
System.out.print("Enter numberof Years:");
int numberYear =s.nextInt();
System.out.print("Enter Annual Interest Rate:");
int annualRate = s.nextInt();


double monthlyrate= annualRate/1200;
double monthlyPayment = loanAmount*monthlyrate/(1 -1/Math.pow(1+monthlyrate,numberYear*12));


System.out.printf("%6.3f",monthlyPayment);


// TODO code application logic here
}

}