import sys

sys.setrecursionlimit(10**6)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.buffer.readline())
def MI(): return map(int, sys.stdin.buffer.readline().split())
def MI1(): return map(int1, sys.stdin.buffer.readline().split())
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def LI1(): return list(map(int1, sys.stdin.buffer.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def BI(): return sys.stdin.buffer.readline().rstrip()
def SI(): return sys.stdin.buffer.readline().rstrip().decode()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
dij = [[(-1, 0), (1, 0)], [(0, -1), (0, 1)]]
inf = 10**16
# md = 998244353
md = 10**9+7

class UnionFind:
    def __init__(self, n):
        self.state = [-1] * n
        # self.size_table = [1] * n
        # cntはグループ数
        # self.cnt = n

    def root(self, u):
        v = self.state[u]
        if v < 0: return u
        self.state[u] = res = self.root(v)
        return res

    def merge(self, u, v):
        ru = self.root(u)
        rv = self.root(v)
        if ru == rv: return
        du = self.state[ru]
        dv = self.state[rv]
        if du > dv: ru, rv = rv, ru
        if du == dv: self.state[ru] -= 1
        self.state[rv] = ru
        # self.cnt -= 1
        # self.size_table[ru] += self.size_table[rv]
        return

n,m,k=MI()
abc=LLI(m)

uf=UnionFind(n)
keep=[False]*m
for _ in range(k):
    i=II()-1
    keep[i]=True
    a,b,c=abc[i]
    uf.merge(a-1,b-1)

cabi=[(c,a-1,b-1,i) for i,(a,b,c) in enumerate(abc)]
cabi.sort(key=lambda x:x[0])
ans=0
for c,a,b,i in cabi:
    if keep[i]:continue
    if uf.root(a)==uf.root(b):
        ans+=c
    else:
        uf.merge(a,b)

print(ans)