import sys
sys.setrecursionlimit(10 ** 9)
import pypyjit
pypyjit.set_param('max_unroll_recursion=-1')
MOD = 10 ** 9 + 7

n = int(input())
edges = [[] for _ in range(n)]
for _ in range(n - 1):
    a, b, c = map(int, input().split())
    a -= 1
    b -= 1
    edges[a].append((b, c))
    edges[b].append((a, c))

dp = [[1] * 30 for _ in range(n)]
ans = 0
bi = [1 << i for i in range(30)]
def dfs(pos, bpos):
    global ans
    for npos, c in edges[pos]:
        if npos == bpos:
            continue
        else:
            pass
        dfs(npos, pos)
        for i in range(30):
            if c >> i & 1:
                ans += dp[pos][i] * dp[npos][i] * bi[i]
                ans %= MOD
                dp[pos][i] += dp[npos][i]
            else:
                pass
        
    
dfs(0, -1)
print(ans)