typedef unsigned short int sh;
typedef   signed short int ss;
typedef unsigned int ui;
typedef unsigned char uc;
#define S (-1)
#include <stdio.h>
// typedef struct{ui M; ss P; sh L; uc s; uc r; uc pad[0];} packet; // BE
   typedef struct{uc pad[0]; uc r; uc s; sh L; ss P; ui M;} packet; // LE
void nerr(int, packet *);
void send(packet *, int);
void keep(packet *);

void fp(packet * p, int j){ui toll = 3+(p->L>>5); 
   if(toll > p->M) return; p->M -= toll;
   if(p->r >= p->s) {nerr(1, p); goto e;}
   int k = p->pad[S*p->r]; if(k>15) {nerr(2, p); goto e;}
   p->pad[S*(p->r++)] = p->P<0?j:0;
   if(k) send(p, k); else keep(p); e: ;}

int main(){printf("%d\n", (int)sizeof(packet)); return 0;}