#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;
struct dak
{
int v;
ll w;
bool operator <(const dak &o)
const
{
return w>o.w;
}
};
priority_queue<dak> f[1<<5];
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;
f[mask].push({i, 0});
}
for(int i = 0; i < (1<<k); i++)
{
while(f[i].size())
{
dak v=f[i].top();
f[i].pop();
if(dp[v.v][i]!=v.w) continue;
for(auto it:adj[v.v])
{
int nxt=i|((id[it.fi]==-1)?0:(1<<id[it.fi]));
if(dp[it.fi][nxt]>dp[v.v][i]+it.se)
dp[it.fi][nxt]=dp[v.v][i]+it.se, f[nxt].push({it.fi, dp[it.fi][nxt]});
}
int rev=((1<<k)-1)^i;
for(int m1 = rev; m1 > 0; m1=(m1-1)&rev)
{
int nxt=i|m1;
if(dp[v.v][nxt]>dp[v.v][i]+dp[v.v][m1])
dp[v.v][nxt]=dp[v.v][i]+dp[v.v][m1], f[nxt].push({v.v, dp[nxt][v.v]});
}
}
}
for(int i = 1; i <= n; i++)
ans=min(ans, dp[i][(1<<k)-1]);
cout<<ans;
}
