# 非再帰で実装
# pypy  : ローカルだと  1900 ms くらい
# python: ローカルだと 14000 ms くらい

import sys

input = sys.stdin.readline
sys.setrecursionlimit(10**7)


def main():
    N = int(input())
    G = [[] for _ in range(N)]
    for _ in range(N - 1):
        u, v = map(int, input().split())
        u -= 1
        v -= 1
        G[u].append(v)
        G[v].append(u)
    A = list(map(int, input().split()))

    MOD = 10**9 + 7
    B = 30
    ans = 0

    # 非再帰
    # Ref: https://qiita.com/Kiri8128/items/2b0023bed9af642c751c

    par = [-1] * N
    dp = [[0] * 2 for _ in range(N)]
    for b in range(B):
        stack = [~0, 0]  # スタック
        while stack:
            u = stack.pop()

            if u >= 0:  # 行きがけの処理
                for v in G[u]:
                    if par[u] == v:
                        continue
                    if par[v] == -1:
                        par[v] = u
                    stack.append(~v)
                    stack.append(v)

            else:  # 帰りがけの処理
                u = ~u
                dp[u][0] = dp[u][1] = 0
                dp[u][(A[u] >> b) & 1] = 1
                for v in G[u]:
                    if par[u] == v:
                        continue
                    dp_new = [0] * 2
                    dp_u = dp[u]
                    dp_v = dp[v]

                    # 切る
                    dp_new[0] += dp_u[0] * dp_v[1]
                    dp_new[1] += dp_u[1] * dp_v[1]

                    # 切らない（繋ぐ）
                    dp_new[0] += dp_u[0] * dp_v[0]
                    dp_new[1] += dp_u[0] * dp_v[1]
                    dp_new[1] += dp_u[1] * dp_v[0]
                    dp_new[0] += dp_u[1] * dp_v[1]

                    dp_new[0] %= MOD
                    dp_new[1] %= MOD
                    dp[u] = dp_new

        ans += (1 << b) * dp[0][1]
        ans %= MOD

    print(ans)


if __name__ == "__main__":
    main()