The first line of input contains 5 space-separated integers: N,xL,yL,xB,yB

where (xL,yL) is the location of the laser and (xB,yB) is the location of the barn.

All coordinates are between 0 and 1,000,000,000

The next N lines each contain the xx and y locations of a fence post,

both integers in the range 0…1,000,000,000

第一行包含5个正整数，分别是N,x1,y1,x2,y2，N的意义如题所述，(x1,y1)为激光发射器的坐标，(x2,y2)为目标点的坐标。

0<=x1,y1,x2,y2<=1,000,000,000

接下来N行，每行两个整数x,y表示坑的坐标。

0<=x,y<=1,000,000,000

0<=x1,y1,x2,y2<=1,000,000,000

接下来N行，每行两个整数x,y表示坑的坐标。

0<=x,y<=1,000,000,000