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)]
p=[0]*n
o=[]
v=[0]*n
q=[0]
while len(q)>0:
  s=q[-1]
  if v[s]==0:
    v[s]=1
    for t,_ in e[s]:
      if v[t]==0:
        q+=[t]
        p[t]=s
  else:
    o+=[s]
    v[s]=0
    q.pop()
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
  for s in o:
    u[s]=0
    for t,c in e[s]:
      if t!=p[s] and (c>>i)&1==1:
        u[s]+=u[t]+1
        u[s]%=M
        a-=(u[t]+1)*(u[t]+1)
        a%=M
    a+=u[s]*2
    a+=u[s]*u[s]
    a%=M
  ans+=a*i2*pow(2,i,M)
  ans%=M
print(ans)