#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn=1e5+5;
const int inf=1e18;
int n,m,k,dp[40][maxn],imcity[10];
vector<pair<int,int>>g[maxn];
int MASK(int x)
{
return 1<<x;
}
int fullmask(int x)
{
return (1<<x)-1;
}
int32_t main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
// freopen("cities.inp","r",stdin); freopen("cities.out","w",stdout);
cin>>n>>k>>m;
for(int i=1;i<=k;i++) cin>>imcity[i];
for(int i=1;i<=m;i++)
{
int u,v,w;
cin>>u>>v>>w;
g[u].push_back({v,w});
g[v].push_back({u,w});
}
for(int i=1;i<=fullmask(k);i++)
{
for(int j=1;j<=n;j++)
{
dp[i][j]=inf;
}
}
priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>>pq;
for(int i=1;i<=k;i++)
{
int curmask=MASK(i-1);
dp[curmask][imcity[i]]=0;
pq.push({0,imcity[i]});
while(pq.size())
{
pair<int,int>res=pq.top();
pq.pop();
int u=res.second,w=res.first;
if(w>dp[curmask][u]) continue;
for(pair<int,int> v:g[u])
{
if(dp[curmask][v.first]>w+v.second)
{
dp[curmask][v.first]=w+v.second;
pq.push({dp[curmask][v.first],v.first});
}
}
}
}
// cout<<MASK(k);
for(int mask=1;mask<MASK(k);mask++)
{
for(int submask=mask;submask>0;submask=(submask-1)&mask)
{
int other=mask^submask;
for(int j=1;j<=n;j++)
{
if(dp[submask][j]+dp[other][j]<dp[mask][j])
{
dp[mask][j]=dp[submask][j]+dp[other][j];
}
}
}
for(int j=1;j<=n;j++)
{
if(dp[mask][j]!=inf)
{
pq.push({dp[mask][j],j});
}
}
while(pq.size())
{
pair<int,int>res=pq.top();
pq.pop();
int u=res.second,w=res.first;
if(w>dp[mask][u]) continue;
for(pair<int,int> v:g[u])
{
if(dp[mask][v.first]>w+v.second)
{
dp[mask][v.first]=w+v.second;
pq.push({dp[mask][v.first],v.first});
}
}
}
}
int ans=inf;
for(int i=1;i<=n;i++)
{
// cout<<dp[fullmask(k)][i]<<' ';
ans=min(ans,dp[fullmask(k)][i]);
}
cout<<ans;
return 0;
}
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