// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>
using namespace std;
#define nl '\n'
#define f first
#define s second
#define mp make_pair
#define pb push_back
#define sz(x) int(x.size())
template<class T> using V = vector<T>;
template<class T> using pq = priority_queue<T, vector<T>, greater<T>>;
using ll = long long;
using vl = V<ll>;
using vi = V<int>;
using pl = pair<ll, ll>;
using vpl = V<pl>;
const ll INFL = 2e18;
const int kax = 5;
const int nax = 1e5+5;
ll dp[nax][1 << kax];
int main() {
cin.tie(0)->sync_with_stdio(0);
int N, K, M; cin >> N >> K >> M;
for(int i = 0; i < N; i++) for(int j = 0; j < (1 << K); j++) {
dp[i][j] = INFL;
}
for(int i = 0; i < K; i++) {
int x; cin >> x; --x;
dp[x][1 << i] = 0;
}
V<vpl> adj(N); for(int i = 0; i < M; i++) {
int u, v, w; cin >> u >> v >> w; --u, --v;
adj[u].pb(mp(v, w));
adj[v].pb(mp(u, w));
}
pq<pl> q;
for(int m = 1; m < (1 << K); m++) {
for(int u = 0; u < N; u++) {
for(int sub = (m - 1) & m; sub > 0; sub = (sub - 1) & m) {
if (sub < (m ^ sub)) break;
// cout << u << " => " << sub << " " << (m ^ sub);
// cout << " => " << dp[u][sub] << " " << dp[u][m ^ sub] << endl;
dp[u][m] = min(dp[u][m], dp[u][sub] + dp[u][m ^ sub]);
}
// cout << u << " " << dp[u][m] << endl;
}
for(int u = 0; u < N; u++) if (dp[u][m] != INFL) {
q.push(mp(dp[u][m], u));
}
vi vis(N);
while(sz(q)) {
int u = q.top().s; q.pop();
// cout << u << " " << d << endl;
if (vis[u]) continue;
vis[u] = 1;
for(auto& [v, w] : adj[u]) {
if (dp[v][m] > dp[u][m] + w) {
dp[v][m] = dp[u][m] + w;
q.push(mp(dp[v][m], v));
}
}
}
}
ll ans = INFL;
for(int u = 0; u < N; u++) ans = min(ans, dp[u][(1 << K) - 1]);
cout << ans << nl;
exit(0-0);
}
