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

extension (value: Int)
  inline def isSet(digit: Int): Boolean =
    ((value >> digit) & 1) != 0

@main def main =
  inline val MOD = 1000000007
  val n = readLine.toInt
  val edges = Array.fill(n - 1){
    val Array(a, b, c) = readLine.split(' ').map(_.toInt)
    (a - 1, b - 1, c)
  }
  val graph = Array.fill(n){ArrayBuffer[(Int, Int)]()}
  for (a, b, c) <- edges do
    graph(a).addOne((b, c))
    graph(b).addOne((a, c))
  val depth = Array.fill(n){-1}.tap(_(0) = 0)
  val queue = Queue(0)
  while queue.nonEmpty do
    val top = queue.dequeue()
    for (next, _) <- graph(top) if depth(next) == -1 do
      depth(next) = depth(top) + 1
      queue.enqueue(next)
  val fromLeaf = (0 until n).sortBy(depth)(using Ordering[Int].reverse)
  var result = 0L
  for d <- 0 until 30 do
    var onePath = 0L
    val endPath = Array.fill(n){0}
    for node <- fromLeaf do
      var count = 0
      for (child, c) <- graph(node) if depth(child) > depth(node) && c.isSet(d) do
        onePath += (count + 1L) * (endPath(child) + 1L) % MOD
        count += endPath(child) + 1
      endPath(node) = count
    result += (onePath % MOD << d) % MOD
  println(result % MOD)