def Warshall_Floyd(edges,N):
  for k in range(N):
    for i in range(N):
      for j in range(N):
        edges[i][j]=min(edges[i][j],edges[i][k]+edges[k][j])
  return edges

INF=10**18
n,m,K=map(int,input().split())
a=list(map(int,input().split()))
edge=[[INF]*n for i in range(n)]
for i in range(m):
  x,y,k=map(int,input().split())
  x,y=x-1,y-1
  edge[x][y]=k
  edge[y][x]=k
for i in range(n):
  edge[i][i]=0
dist=Warshall_Floyd(edge,n)
dp=[INF]*(1<<n)
dp[0]=0
ans=INF
for bit in range(1<<n):
  if bit==0:
    for j in range(n):
      dp[1<<j]=a[j]
    continue
  if bin(bit).count('1')==K:
    ans=min(ans,dp[bit])
  x=[]
  y=[]
  for i in range(n):
    if bit&(1<<i)==0:
      x.append(i)
    else:
      y.append(i)
  for i in x:
    cost=INF
    for j in y:
      cost=min(cost,dist[i][j])
    dp[bit+2**i]=min(dp[bit+2**i],dp[bit]+cost+a[i])
print(ans)