retrete.java

package retrete;
import java.util.Scanner;
public class retrete {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner teclado = new Scanner(System.in);
        int n;
        n = teclado.nextInt();
        System.out.println("el factorial de n es: " + factorial(n));
    }
    public static int factorial (int n) {
        int aux = 1;
        for (int i = 2; i <= n; i++)
            aux *= i;
        return aux;
    }
}