N=int(raw_input())
points=[map(int,raw_input().split()) for i in range(N)]
ans=1
for i in range(N):
    for j in range(i+1,N):
        for k in range(2):
            for l in range(2):
                cnt=0
                x,y=points[i][k*2],points[i][k*2+1]
                x2,y2=points[j][l*2],points[j][l*2+1]
                if (x,y)==(x2,y2):
                    continue
                vx,vy=x2-x,y2-y
                for t in range(N):
                    a,b,c,d=points[t]
                    wx,wy=a-x,b-y
                    zx,zy=c-x,d-y
                    det1=vy*wx-vx*wy
                    det2=vy*zx-vx*zy
                    if det1*det2<=0:
                       cnt+=1
                ans=max(cnt,ans)
print ans