#include <stdio.h>

int ft_iterative_factorial(int nb)
{
	int i;
	unsigned long long r;

	i = 2;
	r = 1;
	if (nb < 0)
    	return 0;
    if (nb <= 1)
    	return 1;
	while (i <= nb)
	{
		r *= i;
		i++;
	}
	return r;
}

int main()
{
	printf("%d", ft_iterative_factorial(0));
	return 0;
}