Help with Translation, please!

[rgelb@csulb.edu (Robert Gelb)]

I am having a hell of a time translating a little recursive factorial 
program from C to Ada.  Could some please help me.  Below is the C code 
that needs to be translated to ADA


#include <stdio.h>
int factorial(int);

int main() {
	long f;
	int number;

	printf("\nPlease enter factorial number:");
	scanf("%d", &number);	/*get the factorial number*/
	f = factorial(number);  /*invoke factorial function*/
	printf ("Result: %ld", f);
	return 0;
}

int factorial(int n) {
	int ReturnValue;
	if (n > 1)
		ReturnValue = n * factorial(n-1);
	else
		ReturnValue = 1;

	return ReturnValue;
}