def try2():
    timestamps = [None for _ in range(32768)]
    count = int(input())

    for c in range(count):
        start, end, delegated = [int(x) for x in input().split()]
        add = 1 + delegated
        if timestamps[start]:
            timestamps[start][0] += add
        else:
            timestamps[start] = [add,0]
        if timestamps[end]:
            timestamps[end][1] += add
        else:
            timestamps[end] = [0,add]

    result = 0
    guests = 0

    for t in timestamps:
        if t:
            add, remove = t
            guests += add
            result = max(result,guests)
            guests -= remove

    print(result)

try2()