---

import sys
from collections import Counter

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

main()