n=int(input())
e=[[] for i in range(n)]
for _ in range(n-1):
  a,b,c=map(int,input().split())
  a-=1
  b-=1
  e[a]+=[(b,c)]
  e[b]+=[(a,c)]
M=10**9+7
i2=pow(2,M-2,M)
ans=0
v=[0]*n
u=[0]*n
for i in range(30):
  a=0
  q=[0]
  while len(q)>0:
    s=q[-1]
    if v[s]==0:
      v[s]=1
      q+=[t for t,c in e[s] if v[t]==0]
    else:
      u[s]=0
      for t,c in e[s]:
        if v[t]==0 and (c>>i)&1==1:
          u[s]+=u[t]+1
          a-=(u[t]+1)*(u[t]+1)
      a+=u[s]*2
      a+=u[s]*u[s]
      v[s]=0
      q.pop()
  ans+=a*i2*pow(2,i,M)
  ans%=M
print(ans)