main = -> {
    N = gets.to_i
    edges = Array.new(N - 1) { a, b, c = gets.split.map(&:to_i); [a - 1, b - 1, c] }
    
    ans = 0
    (0 .. 30).each do |bit|
        uf = UnionFind.new(N)
        edges.each do |a, b, c|
            uf.merge(a, b) if c[bit] == 1
        end
        leaders = (0 ... N).map { uf.leader(_1) }.uniq
        ans += leaders.sum { |i| k = uf.size(i); k * (k - 1) / 2 } % MOD * 2.pow(bit, MOD)
        ans %= MOD
    end
    
    puts ans
}

MOD = 10**9 + 7

class UnionFind
  def initialize(size); @p = Array.new(size, -1); end
  def leader(i); j = i; j, i = i, @p[j] = @p[i] until @p[i] < 0; i; end
  def merge(i, j); k, l = leader(i), leader(j); return false if k == l; k, l = l, k if @p[k] > @p[l]; @p[k] += @p[l]; @p[l] = k; true; end
  def same?(i, j); leader(i) == leader(j); end
  def size(i); -@p[leader(i)]; end
end

main.call