import sys
from itertools import combinations as combi
input = sys.stdin.readline
N, M, K = map(int, input().split())
a = list(map(int, input().split()))
d = [[10 ** 18] * N for _ in range(N)]
for i in range(M):
  u, v, c = map(int, input().split())
  d[u - 1][v - 1] = c
  d[v - 1][u - 1] = c

for k in range(N):
  for i in range(N):
    for j in range(N): d[i][j] = min(d[i][j], d[i][k] + d[k][j])

res = 10 ** 18
for c in combi(range(N), K):
  cres = 0
  s = [c[0]]
  vis = [0] * N
  while len(s):
    i = s.pop()
    vis[i] = 1
    t = 10 ** 18
    jj = 0
    for j in c:
      if vis[j]: continue
      if i == j: continue
      if t > d[i][j]:
        t = min(t, d[i][j])
        jj = j
    if t == 10 ** 18: break
    cres += t
    if vis[jj]: continue
    vis[jj] = 1
    s.append(jj)
  for i in c: cres += a[i]
  res = min(res, cres)
  #print(c, cres, d)
print(res)