import sys
input = sys.stdin.readline

from collections import deque
from operator import itemgetter

N,M=map(int,input().split())
P=list(map(int,input().split()))

E=[[] for i in range(N)]

for i in range(N-1):
    a,b=map(int,input().split())
    a-=1
    b-=1
    E[a].append(b)
    E[b].append(a)

DIS=[1<<50]*N

Q=deque()

C=list(map(int,input().split()))

for c in C:
    c-=1
    Q.append(c)
    DIS[c]=0

while Q:
    x=Q.popleft()

    for to in E[x]:
        if DIS[to]>DIS[x]+1:
            DIS[to]=DIS[x]+1
            Q.append(to)

C=[]
for i in range(N):
    if len(E[i])==1:
        C.append((P[i],DIS[i]))

C.sort(key=itemgetter(1))
C.sort(key=itemgetter(0),reverse=True)

now=0
ANS=0

for p,d in C:
    if d<=now:
        continue
    else:
        ANS+=p
        now+=1

print(ANS)