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
  for i in c[1: ]:
    t = 10 ** 18
    for j in c:
      if i == j: continue
      t = min(t, d[i][j])
    cres += t
  for i in c: cres += a[i]
  res = min(res, cres)
  #print(c, cres, d)
print(res)