n = int(input())
time = [[] for i in range(32800)]
for i in range(n) :
    left, right, k = map(int, input().split())
    time[left].append((i, k + 1))
    time[right].append((i, k + 1))

friend = {i: 0 for i in range(n)}
voice = 0
voice_max = -1
for i in range(len(time)) :
    if time[i] != [] :
        for el in time[i] :
            if friend[el[0]] == 0 :
                voice += el[1]
            elif friend[el[0]] == 1 :
                voice -= el[1]
            friend[el[0]] += 1
            voice_max = max(voice_max, voice)

print(voice_max)