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

__int64 x[105],y[105];
//求两直线的交点
bool dot(__int64 x1,__int64 y1,__int64 x2,__int64 y2,__int64 x3,__int64 y3,__int64 x4,__int64 y4)
{
	double tx=x1,ty=y1;
	__int64 t1=x1-x3,t2=y3-y4,t3=y1-y3,t4=x3-x4;
	__int64 s1=x1-x2,s2=y3-y4,s3=y1-y2,s4=x3-x4;
	t1*=t2,t3*=t4,s1*=s2,s3*=s4;
	t1-=t3,s1-=s3;
	if(s1==0) return 0;
	double t=t1/double(s1);
	tx+=(x2-x1)*t;
	ty+=(y2-y1)*t;
	if(fabs(tx)==0&&fabs(ty)==0)
		return 1;
	else
		return 0;
}

int main()
{
	int n,m,i,a,b,c,d;
	while(scanf("%d",&n)!=EOF)
	{
		for(i=1;i<=n;i++)
			scanf("%I64d%I64d",&x[i],&y[i]);
		scanf("%d",&m);
		bool flag=0;
		for(i=1;i<=m;i++)
		{
			scanf("%d%d%d%d",&a,&b,&c,&d);
		    flag=dot(x[a],y[a],x[b],y[b],x[c],y[c],x[d],y[d]);
		    if(flag)
				break;
		}
		if(flag)
		    printf("%d\n",i);
		else
			printf("0\n");
	}
	return 0;
}