main = -> {
    N = gets.to_i
    edges = Array.new(N - 1) { a, b, c = gets.split.map(&:to_i); [a - 1, b - 1, c] }
    
    fact = Factorial.new(N, MOD)
    
    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| fact.comb(uf.size(i), 2) } * 2.pow(bit, MOD)
        ans %= MOD
    end
    
    puts ans
}

MOD = 10**9 + 7

class Factorial
  def initialize(max, mod)
    @mod = mod
    @fac = [1, 1]
    @fin = [1, 1]
    @inv = [nil, 1]
    (2 .. max).each do |i|
      @fac[i] = @fac[i - 1] * i % mod
      @inv[i] = mod - @inv[mod % i] * (mod / i) % mod
      @fin[i] = @fin[i - 1] * @inv[i] % mod
    end
  end
  
  def fact(n)
    @fac[n]
  end
  
  def comb(n, k)
    return 0 if n < k or n < 0 or k < 0
    @fac[n] * @fin[k] % @mod * @fin[n - k] % @mod
  end
end

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