N = int(input())
X =[0]*N
Y =[0]*N
for i in range(N):
    X[i],Y[i] = map(int,input().split())
ans = 0
for i in range(N):
    for j in range(i+1,N):
        cnt=2
        A = (X[i]-X[j])**2+(Y[i]-Y[j])**2
        for k in range(j+1,N):
            B = (X[j]-X[k])**2+(Y[j]-Y[k])**2
            C = (X[k]-X[i])**2+(Y[k]-Y[i])**2            
            if 4*A*B==(C-B-A)**2 or 4*C*B==(A-B-C)**2 or C == 4*C*A==(B-A-C)**2 :
                cnt+=1
        ans = max(ans,cnt)

print(ans)