---

import sys
from collections import Counter

def main():
    data = sys.stdin.read().split()
    n = int(data[0])
    nums = list(map(int, data[1:]))
    m = min(n, len(nums) // 3)
    cxy, cxz, cyz = Counter(), Counter(), Counter()
    for i in range(m):
        x, y, z = nums[3 * i], nums[3 * i + 1], nums[3 * i + 2]
        cxy[(x, y)] += 1
        cxz[(x, z)] += 1
        cyz[(y, z)] += 1
    print(max(max(cxy.values()), max(cxz.values()), max(cyz.values())))

main()