n = int(input())
xy = [list(map(int,input().split()))for i in range(n)]
ans = 0
for i in range(n):
    for j in range(i+1,n):
        res = 2
        for k in range(n):
            if k == i or  k == j:continue
            x1,y1 = xy[i][0],xy[i][1]
            x2,y2 = xy[j][0],xy[j][1]
            x3,y3 = xy[k][0],xy[k][1]
            dist1 = (x1-x2)**2 + (y1 - y2)**2
            dist2 = (x3-x2)**2 + (y3 - y2)**2
            dist3 = (x1-x3)**2 + (y1 - y3)**2
            a = 4*dist1*dist2 == (dist3 - dist1 - dist2)**2
            b = 4*dist3*dist2 == (dist1 - dist3 - dist2)**2
            c = 4*dist1*dist3 == (dist2 - dist1 - dist3)**2
            if a or b or c:res += 1
        ans = max(ans,res)
print(ans)