n,m=map(int,input().split())
p=list(map(int,input().split()))
e=[[] for i in range(n)]
for i in range(n-1):
  u,v=map(int,input().split())
  u-=1
  v-=1
  e[u]+=[v]
  e[v]+=[u]
d=[len(e[i]) for i in range(n)]
v=[0]*n
c=list(map(int,input().split()))
q1=[]
for i in c:
  i-=1
  v[i]=1
  q1+=[i]
from heapq import heappush,heappop
q2=[]
for i in range(n):
  if d[i]==1 and v[i]==0:
    heappush(q2,(-p[i],i))
ans=0
for _ in range(n):
  while len(q2)>0 and v[q2[0][1]]:
    heappop(q2)
  if len(q2)>0:
    a,i=heappop(q2)
    a=-a
    ans+=a
    v[i]=1
    for j in e[i]:
      d[j]-=1
      if d[j]==1:
        heappush(q2,(-p[j],j))
  nq=[]
  for i in q1:
    for j in e[i]:
      if v[j]==0:
        v[j]=1
        nq+=[j]
  q1=nq
print(ans)