typedef unsigned short sh;
typedef unsigned int ui;
typedef unsigned char uc;
extern long int booty;
// coded here for a big endian machine.
typedef struct {ui M; sh P, L; uc s, c; char p[0];} pk;
void NewDG(pk * pp, int ifi){ // New datagram from interface ifi
  {int toll = 3*((int)(pp->P)+pp->L); pp->M -= toll; booty += toll;}
  {int to = ({int s = (pp->c)++; 15&(*(pp->p + s/2) >> ((s&1)<<2));});
  int ifo = ifi^to; // ifo is outgoing interface.
  
}}