from math import sqrt
N=int(input())
coords=list()
for i in range(N):
    X,Y=map(int,input().split())
    coords.append(complex(X,Y))
ms=[coords[j]-coords[i] for i in range(N) for j in range(i+1,N)]

ans=0
for i in range(len(ms)):
    s_i=0
    for j in range(len(ms)):
        if (ms[i]*ms[j].conjugate()).imag==0:
            s_i+=1
        
    if ans<s_i:ans=s_i
ans=int(sqrt(8*ans+1)+1)//2
print(ans)