#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define ll long long
ll mod=998244353;
int inf=1000000007;
ll infl=1000000000000000007;
const int N=100007,K=5;
ll DP[N][1<<K];
bool odw[N][1<<K];
vector<pair<int,ll>>G[N];
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n,k,m,a,b,c;
cin>>n>>k>>m;
for(int i=1;i<=n;i++)
{
for(int j=1;j<(1<<k);j++) DP[i][j]=infl;
}
priority_queue<pair<ll,int>>Q;
for(int i=1;i<=k;i++)
{
cin>>a;
Q.push({0,a*(1<<k)+(1<<(i-1))});
DP[a][(1<<(i-1))]=0;
}
for(int i=0;i<m;i++)
{
cin>>a>>b>>c;
G[a].pb({b,c});
G[b].pb({a,c});
}
while(sz(Q)>0)
{
ll t=-Q.top().st;
int v=Q.top().nd/(1<<k),x=Q.top().nd%(1<<k);
Q.pop();
if(odw[v][x]) continue;
odw[v][x]=1;
for(auto u:G[v])
{
int d=(1<<k)-1-x;
for(int y=d;;y=(y-1)&d)
{
if(t+u.nd+DP[u.st][y]<DP[u.st][x^y])
{
DP[u.st][x^y]=t+u.nd+DP[u.st][y];
Q.push({-DP[u.st][x^y],u.st*(1<<k)+(x^y)});
}
if(y==0) break;
}
}
}
ll ans=infl;
for(int i=1;i<=n;i++) ans=min(ans,DP[i][(1<<k)-1]);
cout<<ans;
return 0;
}
