N,M,K=map(int,input().split())
A=list(map(int,input().split()))

inf=float("inf")
T=[[inf]*N for _ in range(N)]

for _ in range(M):
    x,y,z=map(int,input().split())
    x-=1; y-=1
    T[x][y]=T[y][x]=z

# WF
for i in range(N):
    T[i][i]=0

for k in range(N):
    Tk=T[k]
    for i in range(N):
        Ti=T[i]
        for j in range(N):
            Ti[j]=min(Ti[j], Ti[k]+Tk[j])

DP=[inf]*(1<<N); DP[0]=0
for i in range(N):
    DP[1<<i]=A[i]

for S in range(1,1<<N):
    U=[]
    V=[]
    SS=S
    for x in range(N):
        if SS&1:
            U.append(x)
        else:
            V.append(x)
        SS>>=1

    for v in V:
        L=inf
        Tv=T[v]
        for u in U:
            L=min(L,Tv[u])

        DP[S|(1<<v)]=min(DP[S|1<<v], DP[S]+A[v]+L)

popcount=[0]*(1<<N)
for S in range(1,1<<N):
    x=S&(-S)
    popcount[S]=popcount[S^x]+1

X=inf
for S in range(1<<N):
    if popcount[S]==K:
        X=min(X,DP[S])

print(X)