#include<bits/stdc++.h>
using namespace std;
#define int long long
typedef pair<int, int> pii;
const int inf=1e18;
signed main() {
cin.tie(0)->sync_with_stdio(false);
int n, k, m;
cin >> n >> k >> m;
vector<int> imp(k);
vector<vector<pii>> adj(n+1, vector<pii>());
for (int i = 0; i < k; ++i) cin >> imp[i];
for (int i = 0; i < m; ++i) {
int a, b, c;
cin >> a >> b >> c;
adj[a].push_back({c, b});
adj[b].push_back({c, a});
}
priority_queue<pii, vector<pii>, greater<pii>> pq;
vector<vector<int>> dp(1<<(--k), vector<int>(n+1, inf));
for (int i = 0; i < k; ++i) dp[1<<i][imp[i]]=0;
for (int mask = 1; mask < (1<<k); ++mask) {
for (int sub = mask; sub; sub = (sub-1)&mask) {
for (int i = 1; i <= n; ++i) {
dp[mask][i]=min(dp[mask][i], dp[sub][i]+dp[mask^sub][i]);
}
}
auto &d=dp[mask];
for (int i = 1; i <= n; ++i) pq.push({d[i], i});
while (!pq.empty()) {
auto [c, u]=pq.top(); pq.pop();
if (c>d[u]) continue;
else d[u]=c;
for (auto [w, v] : adj[u]) {
if (d[v]<w+c) continue;
pq.push({w+c, v});
}
}
}
cout << dp[(1<<k)-1][imp[k]] << '\n';
return 0;
}
