#include <stdio.h>

int factorial(int n)
{
	if(!n)
		return 1;
	return n * factorial(n-1);
}


int main()
{
	int result, input;
	
	printf("Please input the number: ");
	scanf("%d", &input);
	result = factorial(input);

	printf("The factorial of %d is %d \n", input, result);
	return 0;
}