#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N = int(readline())
m = map(int, read().split())
A, B, C = zip(*zip(m, m, m))


class MaxBIT():
    def __init__(self, max_n):
        self.size = max_n + 1
        self.data = [0] * self.size

    def get_max(self, i):
        s = 0
        while i:
            t = self.data[i]
            if s < t:
                s = t
            i -= i & -i
        return s

    def update(self, i, x):
        while i < self.size:
            if self.data[i] >= x:
                return
            self.data[i] = x
            i += i & -i


def compress(A):
    x_to_i = {x: i for i, x in enumerate(sorted(set(A)), 1)}
    return [x_to_i[x] for x in A]


A = compress(A)
B = compress(B)
A_to_BC = [[] for _ in range(N + 10)]
for a, b, c in zip(A, B, C):
    A_to_BC[a].append((b, c))

dp = MaxBIT(N)

for BC in A_to_BC:
    update = []
    for b, c in BC:
        update.append((b, dp.get_max(b - 1) + c))
    for b, x in update:
        dp.update(b, x)

print(dp.get_max(N))