Fatorial em C

#include <stdio.h>
#include <stdlib.h>
unsigned int FACTORIAL (int N){
int I, FACT = 1;
if(N < 0)
return 0;
for(I = 2; I<=N; I++)
FACT *= I;
return FACT;
}
int main(){
int num;
printf("Digite o valor a ser calculador: ");
scanf("%d",&num);
printf("\nFatorial de %d = %d \n\n", num, FACTORIAL(num));

return EXIT_SUCCESS;
}