#include <stdio.h>
#include <math.h>

long x1,x2,x3,y1,y2,y3,
    i,n,v,
    x,y,z,
    nr;

inline long det3 (long a11, long a12, long a13,
	   long a21, long a22, long a23,
	   long a31, long a32, long a33){
  return labs(a11*(a22*a33-a23*a32)+
	a21*(a32*a13-a12*a33)+
	a31*(a12*a23-a22*a13));
}

void main(void){
  FILE *f=fopen("TRIUNGHI.IN","rt");
  FILE *g=fopen("TRIUNGHI.OUT","wt");
  fscanf(f,"%ld%ld%ld%ld%ld%ld",
	    &x1,&y1,&x2,&y2,&x3,&y3);
  fscanf(f,"%ld",&n);
  v=det3(x1,y1,1,x2,y2,1,x3,y3,1);
  for (i=0;i<n;i++){
    fscanf(f,"%ld%ld",&x,&y);
     if (v==det3(x,y,1,x2,y2,1,x3,y3,1)+
	    det3(x1,y1,1,x,y,1,x3,y3,1)+
	    det3(x1,y1,1,x2,y2,1,x,y,1))
      nr++;
  }
  fprintf(g,"%ld",nr);
  printf("%ld\n",nr);
  fclose(f);
  fclose(g);
}