#include<iostream>
using namespace std;
#define zero 0.00000001

int n;
double xm,ym;

struct point{
       int x1;
       int y1;
       int x2;
       int y2;
       }wall[40];
int side1[40];
int side2;

struct out{
       int x;
       int y;
       }outer[40];

int main()
{   int x1,y1,n;
    int a,b,c;
    outer[0].x=0;
    outer[0].y=0;
    outer[1].x=0;
    outer[1].y=100;
    outer[2].x=100;
    outer[2].y=0;
    outer[3].x=100;
    outer[3].y=100;
    int sp=3;
    scanf("%d",&n);
    for(int i=0;i<n;i++)
    {
       scanf("%d%d%d%d",&wall[i].x1,&wall[i].y1,&wall[i].x2,&wall[i].y2);
       outer[++sp].x=wall[i].x1;
       outer[sp].y=wall[i].y1;
       outer[++sp].x=wall[i].x2;
       outer[sp].y=wall[i].y2;
     }
    scanf("%lf%lf",&xm,&ym);
    double s;
    for(int i=0;i<n;i++)
    {  a=wall[i].y2-wall[i].y1;
       b=wall[i].x1-wall[i].x2;
       c=wall[i].x2*wall[i].y1-wall[i].x1*wall[i].y2;
       s=a*xm+b*ym+c;
       if(s>zero) side1[i]=1;
         else if(s<zero)side1[i]=-1;
           else side1[i]=0; 
     }
     int num;
     int minn=9999;
    for(int i=0;i<sp;i++)
     for(int j=i+1;j<sp;j++)
     {   
         x1=outer[i].x+outer[j].x;
         y1=outer[i].y+outer[j].y;
         if((x1==0)||(x1==200)||(y1==0)||(y1==200))
         {  num=0;
           for(int k=0;k<n;k++)
           { 
           a=wall[k].y2-wall[k].y1;
           b=wall[k].x1-wall[k].x2;
           c=wall[k].x2*wall[k].y1-wall[k].x1*wall[k].y2;
           if(a*x1+b*y1+2*c>zero)side2=1;
           else if(a*x1+b*y1+2*c<zero)side2=-1;
           else 
           {
            num=9999;break;
            }
           if(side1[k]!=side2)num++;
           }
           if(num<minn)minn=num;
           }
     }
     
     printf("Number of doors = %d\n",++minn);
     
    // system("pause");
     return 0;            
                       
        
}