#include <bits/stdc++.h>
#define x first
#define y second
#define pb push_back
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pii;
const int MAXN = 1e5 + 10;
ll n, m, kk;
vector<pii> k[MAXN];
ll di[MAXN][40];
bool vis[MAXN][40];
int main(){
ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
cin >> n >> kk >> m;
for(int i=0; i<=n; i++)
for(int j=0; j<40; j++)
di[i][j] = 1e16;
//priority_queue<pair<ll, pii>, vector<pair<ll, pii>>, greater<pair<ll, pii>>> q;
queue<pii> q;
for(int i=0; i<kk; i++){
int cu; cin >> cu;
di[cu][1<<i] = 0;
q.push({cu, 1<<i});
vis[cu][1<<i] = 1;
}
for(int i=0; i<m; i++){
ll fr, to, co; cin >> fr >> to >> co;
k[fr].pb({to, co});
k[to].pb({fr, co});
}
while(!q.empty()){
auto x = q.front();
q.pop();
vis[x.x][x.y] = 0;
ll cdi = di[x.x][x.y];
//cout << x.y.x << " " << bitset<3>(x.y.y) << " " << x.x << endl;
int oma = ~x.y;
int i = 0;
while(i < (1<<kk)){
int a = i ^ oma;
a = a & -a;
i ^= a;
i &= -a;
//cout << i << " " << x.y.y << endl;
int nm = i | x.y;
if(di[x.x][nm] > cdi + di[x.x][i]){
di[x.x][nm] = cdi + di[x.x][i];
if(!vis[x.x][nm]){
vis[x.x][nm] = 1;
q.push({x.x, nm});
}
}
}
for(auto u : k[x.x]){
if(di[u.x][x.y] > cdi + u.y){
di[u.x][x.y] = cdi + u.y;
if(!vis[u.x][x.y]){
vis[u.x][x.y] = 1;
q.push({u.x, x.y});
}
}
}
}
ll ans = 1e16;
for(int i=1; i<=n; i++)
ans = min(ans, di[i][(1<<kk)-1]);
cout << ans << endl;
}
