#include <bits/stdc++.h>
#define ii pair<int, int>
#define fi first
#define se second
#define inf 0x3f3f3f3f3f3f3f3f
using namespace std;
using ll = long long;
const ll mod=1e9+7;
const int nx=1e5+5;
int n, m, k, a[nx], id[nx];
vector<ii> adj[nx];
ll dp[nx][32], ans=inf;
priority_queue<tuple<ll, int, int>> q;
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin>>n>>k>>m;
memset(id, -1, sizeof(id));
for(int i = 0; i < k; i++)
cin>>a[i], id[a[i]]=i;
while(m--)
{
int u, v, w;
cin>>u>>v>>w;
adj[u].emplace_back(v, w);
adj[v].emplace_back(u, w);
}
memset(dp, 0x3f, sizeof(dp));
for(int i = 1; i <= n; i++)
{
int mask=(id[i]==-1)?0:(1<<id[i]);
dp[i][mask]=0;
q.push({0, i, mask});
}
while(q.size())
{
ll dis;
int u, mask;
tie(dis, u, mask)=q.top();
q.pop();
if(dp[u][mask]!=dis) continue;
for(auto it:adj[u])
{
int nxt=mask|((id[it.fi]==-1)?0:(1<<id[it.fi]));
if(dp[it.fi][nxt]>dp[u][mask]+it.se)
dp[it.fi][nxt]=dp[u][mask]+it.se, q.push({dp[it.fi][nxt], it.fi, nxt});
}
int rev=((1<<k)-1)^mask;
for(int m1 = rev; m1 > 0; m1=(m1-1)&rev)
{
int nxt=mask|m1;
if(dp[u][nxt]>dp[u][mask]+dp[u][m1])
dp[u][nxt]=dp[u][mask]+dp[u][m1], q.push({dp[u][nxt], u, nxt});
}
}
for(int i = 1; i <= n; i++)
ans=min(ans, dp[i][(1<<k)-1]);
cout<<ans;
}
