n = int(input())

l = [list(map(int, input().split()))for i in range(n)]
nux = 0
for i in range(1, 101):
    for j in range(101):
        num = 0
        for x in range(101):
            y = i*x+j
            if [x, y] in l:
                num += 1
        nux = max(nux, num)

for j in range(101):
    num = 0
    for i in range(n):
        if l[i][0] == j:
            num += 1
            nux = max(nux, num)
print(nux)