import sys

# sys.setrecursionlimit(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 << 63)-1
inf = (1 << 31)-1
# md = 10**9+7
md = 998244353

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):
        stack = []
        while self.state[u] >= 0:
            stack.append(u)
            u = self.state[u]
        for v in stack: self.state[v] = u
        return u

    def same(self, u, v):
        return self.root(u) == self.root(v)

    def merge(self, u, v):
        u = self.root(u)
        v = self.root(v)
        if u == v: return False
        du = -self.state[u]
        dv = -self.state[v]
        if du < dv: u, v = v, u
        if du == dv: self.state[u] -= 1
        self.state[v] = u
        self.cnt -= 1
        self.size_table[u] += self.size_table[v]
        return True

    # グループの要素数
    def size(self, u):
        return self.size_table[self.root(u)]

from itertools import combinations

def cost(uu):
    res = sum(aa[u] for u in uu)

    ee = []
    for i, u in enumerate(uu):
        for v in uu[:i]:
            ee.append((dist[u][v], u, v))
    ee.sort(key=lambda x: x[0])

    uf = UnionFind(n)
    for d, u, v in ee:
        if uf.same(u, v): continue
        uf.merge(u, v)
        res += d
    return res

n, m, k = LI()
aa = LI()

dist = [[inf]*n for _ in range(n)]
for u in range(n): dist[u][u] = 0
for _ in range(m):
    u, v, z = LI()
    u, v = u-1, v-1
    dist[u][v] = dist[v][u] = z

for v in range(n):
    for u in range(n):
        for w in range(n):
            dist[u][w] = min(dist[u][w], dist[u][v]+dist[v][w])

ans = inf
for uu in combinations(range(n), k):
    ans = min(ans, cost(uu))
print(ans)