import collections

MOD = 1000000007
n = int(input())
edges = [map(int, input().split()) for _ in range(n - 1)]
graph = [[] for _ in range(n)]
for [a, b, c] in edges:
    graph[a - 1].append([b - 1, c])
    graph[b - 1].append([a - 1, c])
depth = [-1] * n
depth[0] = 0
stack = collections.deque()
stack.append(0)
while stack:
    top = stack.pop()
    for [to, _] in graph[top]:
        if depth[to] == -1:
            depth[to] = depth[top] + 1
            stack.append(to)
fromLeaf = sorted([i for i in range(n)], key = lambda i: depth[i], reverse = True)
result = 0
for d in range(30):
    onePath = 0
    endPath = [0] * n
    for node in fromLeaf:
        count = 0
        for [child, c] in graph[node]:
            if depth[child] <= depth[node] or ((c >> d) & 1) == 0:
                continue
            onePath += (count + 1) * (endPath[child] + 1)
            count += endPath[child] + 1
        endPath[node] = count
    result += onePath % MOD << d

print(result % MOD)