// Fact.java

public class Fact { 
    public static int fact(int x) {
        if (x == 0) {
            return 1;
        } else {
            return x * fact(x - 1);
        }
    }

    public static void main(String[] args) {
        for (int i = 1; i <= 10; i++) {
            System.out.println(i + "! = " + fact(i));
        }
    }
}