#include <bits/stdc++.h>
using namespace std;
#define int long long
#define stoi stoll
using ll=long long;
using vi=vector<int>;
using pii=pair<int,int>;
#define ALL(c) begin(c),end(c)
#define RALL(c) rbegin(c),rend(c)
#define ITR(i,b,e) for(auto i=(b);i!=(e);++i)
#define FORE(x,c) for(auto &x:c)
#define REPF(i,a,n) for(int i=a,i##len=(int)(n);i<i##len;++i)
#define REP(i,n) REPF(i,0,n)
#define REPR(i,n) for(int i=(int)(n);i>=0;--i)
#define SZ(c) ((int)c.size())
#define CONTAIN(c,x) (c.find(x)!=end(c))
#define INSEG(l,x,r) ((l)<=(x)&&(x)<(r))
#define dump(...)
#define pb push_back
#define _ 0
const signed INF_=1001001001; const long long INF=1001001001001001001LL;
const int DX[9]={0,1,0,-1,1,1,-1,-1,0},DY[9]={-1,0,1,0,-1,1,1,-1,0};
template<class T> ostream& operator<<(ostream &os,const vector<T> &v) {
    ITR(i,begin(v),end(v))os<<*i<<(i==end(v)-1?"":" ");return os;}
template<class T> istream& operator>>(istream &is,vector<T> &v) {
    ITR(i,begin(v),end(v)) is>>*i;return is;}
template<class T,class U> istream& operator>>(istream &is, pair<T,U> &p) {
    is>>p.first>>p.second;return is;}
template<class T, class U> bool chmax(T &a,const U &b){return a<b?a=b,1:0;}
template<class T, class U> bool chmin(T &a,const U &b){return a>b?a=b,1:0;}
template <class T> void PSUM(T& c) {partial_sum(begin(c), end(c), begin(c));}
template<class T> using heap=priority_queue<T,vector<T>,greater<T>>;
struct before_main_function {
    before_main_function() {
        cin.tie(0); ios::sync_with_stdio(false);
        cout << setprecision(15) << fixed;
        #define endl "\n"
    }
} before_main_function;
//------------------8<------------------------------------8<--------------------

struct union_find {
    vector<int> data;
    union_find(int size) : data(size, -1) {}
    void unite(int x, int y) {
        x = root(x); y = root(y);
        if(x != y) {
            if(data[y] < data[x]) swap(x, y);
            data[x] += data[y];
            data[y] = x;
        }
    }
    bool same(int x, int y) {
        return root(x) == root(y);
    }
    int root(int x) {
        return data[x] < 0 ? x : (data[x] = root(data[x]));
    }
    int size(int x) {
        return -data[root(x)];
    }
};

signed main() {
    int N, M, K;
    cin >> N >> M >> K;
    vector<vi> edge(M);
    union_find uf(N);
    REP(i, M) {
        int a, b, c;
        cin >> a >> b >> c;
        a--, b--;
        edge[i] = {c, a, b};
    }
    
    int ans = 0;
    
    REP(i, K) {
        int e;
        cin >> e;
        e--;
        int c = edge[e][0];
        int a = edge[e][1];
        int b = edge[e][2];
        ans += c;
        uf.unite(a, b);
        edge[e].pb(1);
    }
    
    sort(ALL(edge));
    
    REP(i, SZ(edge)) {
        if (SZ(edge[i]) == 4) continue;
        int c = edge[i][0];
        int a = edge[i][1];
        int b = edge[i][2];
        if (!uf.same(a, b)) {
            ans += c;
            uf.unite(a, b);
        }
    }

    int total = 0;
    REP(i, M) total += edge[i][0];
    cout << (total - ans) << endl;
    return (0^_^0);
}