#include <iostream>
#include <vector>
#include <tuple>
#include <algorithm>
#define rep(i, n) for(i = 0; i < n; i++)
#define int long long
using namespace std;
typedef tuple<int, int, int> T;

struct UF {
	int par[100000];
	UF() { int i; rep(i, 100000) par[i] = i; }
	int root(int x) { if (par[x] == x) return x; return par[x] = root(par[x]); }
	void unit(int x, int y) { x = root(x); y = root(y); par[x] = y; }
	bool same(int x, int y) { return root(x) == root(y); }
};

int n, m, k;
int a[100000], b[100000], c[100000];
int e[100000];
T edges[100000];
UF uf;

signed main() {
	int i;
	
	cin >> n >> m >> k;
	rep(i, m) { cin >> a[i] >> b[i] >> c[i]; a[i]--; b[i]--; }
	rep(i, k) { cin >> e[i]; e[i]--; c[e[i]] = 0; }
	rep(i, m) { edges[i] = T(c[i], a[i], b[i]); }
	sort(edges, edges + m);
	
	int ans = 0;
	rep(i, m) {
		int cst = get<0>(edges[i]);
		int u = get<1>(edges[i]);
		int v = get<2>(edges[i]);
		if (uf.same(u, v)) {
			ans += cst;
		}
		else {
			uf.unit(u, v);
		}
	}
	cout << ans << endl;
	return 0;
}