import sys
from operator import itemgetter
from collections import defaultdict, deque
import heapq
import bisect
from itertools import combinations

stdin=sys.stdin
sys.setrecursionlimit(10 ** 8)

ip=lambda: int(sp())
fp=lambda: float(sp())
lp=lambda:list(map(int,stdin.readline().split()))
sp=lambda:stdin.readline().rstrip()
Yp=lambda:print('Yes')
Np=lambda:print('No')
inf = float('inf')
eps = 1e-9
sortkey = itemgetter(0)

###############################################################

N, M, K = lp()
A = lp()
edges = [[inf for _ in range(N)] for _ in range(N)]
for i in range(N):
    edges[i][i] = 0

for _ in range(M):
    x, y, z = lp()
    x -= 1; y -= 1
    edges[x][y] = z
    edges[y][x] = z

for s in range(N):
    for g in range(N):
        for mid in range(N):
            if s == mid or g == mid:
                continue
            dist = min(edges[s][g], edges[s][mid] + edges[mid][g])
            edges[s][g] = dist

adj = []
for i in range(N - 1):
    for j in range(i + 1, N):
        adj.append((edges[i][j], i, j))
adj.sort()

citys = [i for i in range(N)]
ans = inf
for v in combinations(citys,K):
    temp = 0
    candidate = [0 for _ in range(N)]
    build = [0 for _ in range(N)]
    for city in v:
        temp += A[city]
        candidate[city] = 1
        build[city] = 1

    for cost, x, y in adj:
        if candidate[x] == 1 and candidate[y] == 1:
            if build[x] == 1 and build[y] == 1:
                continue
            if build[x] == 1 or build[y] == 1:
                build[x] &= 0
                build[y] &= 0
                temp += cost
    ans = min(ans, temp)

print(ans)