#include <bits/stdc++.h>
using namespace std;
#define int long long
const int Z = 1e5, INF = 1e18;
int N, K, M, c[5], dp[32][Z];
vector<array<int, 2>> g[Z];
int32_t main() {
ios::sync_with_stdio(0), cin.tie(0);
cin >> N >> K >> M;
for(int i = 0; i < K; ++i)
cin >> c[i], --c[i];
for(int i = 0; i < M; ++i) {
int u, v, w; cin >> u >> v >> w;
--u, --v;
g[u].push_back({v, w});
g[v].push_back({u, w});
}
for(int i = 1; i < (1<<K); ++i)
fill(dp[i], dp[i] + Z, INF);
for(int i = 0; i < K; ++i)
dp[1<<i][c[i]] = 0;
for(int i = 1; i < (1<<K); ++i) {
for(int j = 0; j < K; ++j) if(i & (1<<j)) {
for(int u = 0; u < N; ++u)
dp[i][u] = min(dp[i][u], dp[i ^ (1<<j)][u] + dp[1<<j][u]);
}
int *d = dp[i];
priority_queue<array<int, 2>> q;
for(int u = 0; u < N; ++u)
if(d[u] < INF) q.push({-d[u], u});
while(!empty(q)) {
auto [dist, u] = q.top(); q.pop();
if(dist != -d[u]) continue;
for(auto &[v, w] : g[u])
if(d[u] + w < d[v])
q.push({-(d[v] = d[u] + w), v});
}
}
cout << *min_element(dp[(1<<K)-1], dp[(1<<K)-1] + Z);
}
