import sys # sys.setrecursionlimit(1000005) # sys.set_int_max_str_digits(200005) int1 = lambda x: int(x)-1 pDB = lambda *x: print(*x, end="\n", file=sys.stderr) p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr) def II(): return int(sys.stdin.readline()) def LI(): return list(map(int, sys.stdin.readline().split())) def LLI(rows_number): return [LI() for _ in range(rows_number)] def LI1(): return list(map(int1, sys.stdin.readline().split())) def LLI1(rows_number): return [LI1() for _ in range(rows_number)] def SI(): return sys.stdin.readline().rstrip() dij = [(0, 1), (-1, 0), (0, -1), (1, 0)] # dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)] # inf = -1-(-1 << 31) inf = -1-(-1 << 62) # md = 10**9+7 md = 998244353 n = II() to = [[] for _ in range(n)] deg = [0]*n for _ in range(n-1): u, v = LI1() to[u].append(v) to[v].append(u) deg[u] += 1 deg[v] += 1 m = II() vv=LI1() go = [0]*n tr = [0]*n for v in vv: go[v] = 1 tr[v]+=1 for u in to[v]: tr[u]+=1 one=[0]*n for u in vv: for v in to[u]: one[u]+=tr[v]==1 # pDB(tr) # pDB(one) tot=n-tr.count(0) for u in range(n): ans=tot-one[u] for v in to[u]: ans-=one[v] if go[v] and tr[v]-go[u]-go[v]==0:ans-=1 if go[u] or tr[u]>1:ans-=1 print(ans)