Recursive Power Method Output

What is printed when the following code is executed?

public class PowerCalc {
    public static int power(int base, int exponent) {
        if(exponent == 0) return 1;
        return base * power(base, exponent - 1);
    }
    public static void main(String[] args) {
        System.out.println(power(3, 3));
    }
}