#include <bits/stdc++.h>
// clang-format off
using namespace std; using ll=long long; using ull=unsigned long long; const ll INF=4e18;
void print0(){}; template<typename H,typename... T> void print0(H h,T... t){cout<<h;print0(t...);}
void print1(){print0("\n");}; template<typename H,typename... T>void print1(H h,T... t){print0(h);if(sizeof...(T)>0)print0(" ");print1(t...);}
#define debug1(a) { cerr<<#a<<":"<<a<<endl; }
#define debug2(a,b) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<endl; }
#define debug3(a,b,c) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<" "<<#c<<":"<<c<<endl; }
#define debug4(a,b,c,d) { cerr<<#a<<":"<<a<<" "<<#b<<":"<<b<<" "<<#c<<":"<<c<<" "<<#d<<":"<<d<<endl; }
// clang-format on

namespace SteinerTree {
ll solve(vector<vector<pair<int, ll>>>& graph, vector<bool>& is_city) {
    int N = graph.size();
    int K = 0;
    vector<int> cityid(N, -1);
    for (int u = 0; u < N; u++) {
        if (is_city[u]) {
            cityid[u] = K;
            K++;
        }
    }

    ll ans = INF;
    {
        vector<vector<ll>> dp(N, vector<ll>(1 << K, INF));
        for (int u = 0; u < N; u++) {
            if (cityid[u] >= 0) {
                int city = cityid[u];
                dp[u][1 << city] = 0;
            }
            dp[u][0] = 0;
        }

        for (int s = 1; s < (1 << K); s++) {
            for (int u = 0; u < N; u++) {
                for (int j = s;; j = (j - 1) & s) {
                    int k = s ^ j;  // 残り
                    if (k > 0 && j > 0) {
                        dp[u][s] = min(dp[u][s], dp[u][j] + dp[u][k]);
                    }
                    if (!j) break;
                }
            }
            priority_queue<pair<ll, int>, vector<pair<ll, int>>, greater<pair<ll, int>>> pq;
            for (int u = 0; u < N; u++) {
                int city = cityid[u];
                if (dp[u][s] == INF) continue;
                pq.push({dp[u][s], u});
            }
            vector<bool> done(N);
            while (pq.size()) {
                ll cost;
                int u;
                tie(cost, u) = pq.top();
                pq.pop();
                if (done[u]) continue;
                done[u] = true;
                dp[u][s] = min(dp[u][s], cost);
                if (cityid[u] >= 0) {
                    int t = (1 << cityid[u]) | s;
                    dp[u][t] = min(dp[u][t], cost);
                }
                for (auto e : graph[u]) {
                    pq.push({e.second + cost, e.first});
                }
            }
        }
        for (int u = 0; u < N; u++) {
            ans = min(ans, dp[u][(1 << K) - 1]);
        }
    }
    return ans;
}

};  // namespace SteinerTree

namespace LargeSolver {
class unionfind {
   public:
    vector<int> partition;
    vector<int> rank;
    vector<int> siz;
    int n;
    unionfind(int n_) {
        partition.resize(n_);
        rank.resize(n_);
        siz.resize(n_);
        for (int x = 0; x < n_; x++) {
            partition[x] = x;
            rank[x] = 0;
            siz[x] = 1;
        }
        n = n_;
    }
    int find(int x) {
        if (partition[x] == x) {
            return x;
        } else {
            partition[x] = find(partition[x]);
            return partition[x];
        }
    }
    void unite(int x, int y) {
        x = find(x);
        y = find(y);
        if (x == y) {
            return;
        }
        int sx = siz[x];
        int sy = siz[y];
        if (rank[x] < rank[y]) {
            partition[x] = y;
        } else {
            partition[y] = x;
            if (rank[x] == rank[y]) {
                rank[x]++;
            }
        }
        siz[find(x)] = sx + sy;
    }
    bool same(int x, int y) {
        return find(x) == find(y);
    }
    int clstsize(int x) {
        return siz[find(x)];
    }
    vector<pair<int, vector<int>>> get_clusters() {
        vector<vector<int>> con(n);
        for (int i = 0; i < n; i++) {
            con[find(i)].push_back(i);
        }

        vector<pair<int, vector<int>>> result;
        for (int i = 0; i < n; i++) {
            if (con[i].size() > 0) {
                vector<int> members = con[i];
                result.push_back({i, members});
            }
        }
        return result;
    }
};

int solve(vector<vector<pair<int, ll>>>& graph, vector<bool>& is_city) {
    int N = graph.size();
    vector<int> viintages;
    for (int u = 0; u < N; u++) {
        if (!is_city[u]) viintages.push_back(u);
    }
    vector<int> edgs;
    for (int u = 0; u < N; u++) {
        for (auto e : graph[u]) {
            int v = e.first;
            int c = e.second;
            if (u > v) continue;
            edgs.push_back(c * (1 << 20) + u * (1 << 10) + v);
        }
    }
    sort(edgs.begin(), edgs.end());

    int ans = 1e9;
    int m = viintages.size();
    for (int i = 0; i < (1 << m); i++) {
        int first_city = N;
        int usenum = 0;
        vector<bool> use(N);
        for (int u = 0; u < N; u++) {
            if (is_city[u]) {
                first_city = min(first_city, u);
                use[u] = true;
                usenum++;
            }
        }
        for (int j = 0; j < m; j++) {
            if ((i >> j) & 1) {
                use[viintages[j]] = true;
                usenum++;
            }
        }

        int now = 0;
        auto uf = unionfind(N);
        for (auto e : edgs) {
            int c = e >> 20;
            int u = (e >> 10) & 1023;
            int v = (e & 1023);
            if (!use[u] || !use[v]) continue;
            if (!uf.same(u, v)) {
                uf.unite(u, v);
                now += c;
            }
        }
        if (uf.clstsize(first_city) == usenum) {
            ans = min(ans, now);
        }
    }
    return ans;
}

};  // namespace LargeSolver

int main() {
    ll N, M, T;
    cin >> N >> M >> T;
    vector<vector<pair<int, ll>>> graph(N);
    for (ll i = 0; i < M; i++) {
        ll u, v, c;
        cin >> u >> v >> c;
        u--;
        v--;
        graph[u].push_back({v, c});
        graph[v].push_back({u, c});
    }
    vector<bool> is_city(N);
    for (ll i = 0; i < T; i++) {
        ll u;
        cin >> u;
        u--;
        is_city[u] = true;
    }
    if (T <= 14) {
        print1(SteinerTree::solve(graph, is_city));
    } else {
        print1(LargeSolver::solve(graph, is_city));
    }
}