N = int(input())
multi_eye = {}
for i in range(N):
    eye = input()
    multi_eye.setdefault(eye,0)
    multi_eye[eye]+=1
max_eye = max(multi_eye.values())
multi_eye = [len(x) - 2 for x,y in multi_eye.items() if y == max_eye]
max_eye = max(multi_eye)
print(max_eye)