/* sample C-- program; June 2, 2006 */
#define MAX__S 10000
#include "cmm.c" /* C-- v 2.3 */
factorial()
{
       I__2 = 1;
loop:
       I__3 = POP__S();
       if(I__3 == 0) goto ends;
       I__2 = I__2 * I__3;
       I__3 = I__3 - 1;
       PUSH__S(I__3);
       goto loop;
ends:
       PUSH__S(I__2);
}
main()
{
       INIT__S();
       I__0 = 1;
       scanf("%d",&I__1);
       if(I__1 <= 0) goto done;
       PUSH__S(I__1);
/* compute factorial */
       factorial();
compute:
       I__1 = POP__S();
       I__1 = I__1 - 2;
       if(I__1 <= 0) goto done;
       PUSH__S(I__1);
       I__0 = I__0 * I__1;
       goto compute;
done:
       printf("%d",I__0);
       printf("\n");
}