n,m,K=map(int,input().split())
a=list(map(int,input().split()))
X=10**20
e=[[X]*n for i in range(n)]
for i in range(n):
  e[i][i]=0
for i in range(m):
  x,y,z=map(int,input().split())
  x-=1
  y-=1
  e[x][y]=z
  e[y][x]=z
for k in range(n):
  for i in range(n):
    for j in range(n):
      e[i][j]=min(e[i][j],e[i][k]+e[k][j])
q=[X]*(1<<n)
for i in range(n):
  q[1<<i]=a[i]
for i in range(1<<n):
  if q[i]<X:
    for j in range(n):
      if (i>>j)&1==0:
        q[i|(1<<j)]=min(q[i|(1<<j)],q[i]+a[j]+min(e[j][k] for k in range(n) if (i>>k)&1==1))
print(min(q[i] for i in range(1<<n) if i.bit_count()==K))