#include <stdio.h>

int factorielle(int n)
{
 int r,i;

 r=1;
 for(i=1;i<=n;i=i+1)
 {
  r = r*i;
 }

 return r;
}

int main(void)
{
 int n,r;

 n = 3;
 r = factorielle(n);
 printf("%d!=%d\n",n,r);

 n = 5;
 r = factorielle(n);
 printf("%d!=%d\n",n,r);

 return 0;
}