import scala.collection.mutable
import scala.collection.mutable.ArrayBuffer
import scala.io.StdIn.*
import scala.math.*
import scala.reflect.ClassTag
import scala.util.chaining.*

trait Monoid[T]:
  val zero: T
  def plus(left: T, right: T): T

inline given Monoid[Int] with
  override val zero = 0
  override def plus(left: Int, right: Int) = max(left, right)

class BinaryIndexedTree[T : ClassTag](val size: Int)(using m: Monoid[T]):
  export m.*
  private val vec = Array.fill(size){zero}
  def get(position: Int): T =
    var result = zero
    var pos = position
    while vec.indices.contains(pos) do
      result = plus(result, vec(pos))
      pos -= ~pos & (pos + 1)
    result
  def add(position: Int, value: T): Unit =
    var pos = position
    while vec.indices.contains(pos) do
      vec(pos) = plus(vec(pos), value)
      pos += ~pos & (pos + 1)
  def getAll(): T = get(size - 1)

extension (array: Array[Int])
  def lowerBound(value: Int): Int =
    var min = 0
    var max = array.length
    while min < max do
      val mid = (min + max) >>> 1
      if array(mid) < value then
        min = mid + 1
      else
        max = mid
    max

@main def main =
  val n = readLine().toInt
  val fruits = Array.fill(n){
    val Array(t, x, v) = readLine().split(' ').map(_.toInt)
    (t, x, v)
  }
  val diff = fruits.map{(t, x, _) => t - x}.distinct.sorted
  val bit = BinaryIndexedTree[Int](diff.length)
  for (t, x, v) <- fruits.sorted(using Ordering.by[(Int, Int, Int), Int]{(t, x, _) => t + x}.orElseBy{(t, _, _) => t}) do
    if t >= abs(x) then
      val di = diff.lowerBound(t - x)
      val maxValue = bit.get(di) + v
      bit.add(di, maxValue)
  val result = bit.getAll()
  println(result)