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

citys = [i for i in range(N)]
ans = inf
for v in combinations(citys,K):
    temp = 0
    candidate = [0 for _ in range(N)]
    for city in v:
        temp += A[city]
        candidate[city] = 1
    
    for start in v:
        res = temp
        build = 1
        complete = [0 for _ in range(N)]
        finish = [start]
        complete[start] = 1
        while build < K:
            dist = inf
            nex = -1
            for now in finish:
                for ne in range(N):
                    if candidate[ne] == 1 and complete[ne] == 0 and dist > edges[now][ne]:
                        nex = ne
                        dist = edges[now][ne]
            res += dist
            complete[nex] = 1
            finish.append(nex)
            build += 1

        ans = min(ans, res)

print(ans)