#include<bits/stdc++.h>
using namespace std;
using P = pair<long long, int>;
const long long LM = 1LL << 60;



long long dfs(int p, int par, const vector<vector<P>>& edge, vector<long long>& d) {
    long long mi = d[p];
    for (auto& e : edge[p]) {
        if (e.second == par) continue;
        mi = min(mi, dfs(e.second, p, edge, d) + e.first);
    }
    return d[p] = mi;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    int n, q, c;
    cin >> n >> q >> c;
    vector<vector<P>> edge(n);
    for (int i = 0; i < n - 1; ++i) {
        int u, v, l;
        cin >> u >> v >> l;
        --u;
        --v;
        edge[u].push_back({l, v});
        edge[v].push_back({l, u});
    }
    vector<int> x(q);
    for (int i = 0; i < q; ++i) {
        cin >> x[i];
        --x[i];
    }
    vector<vector<long long>> dist(n, vector<long long>(n, LM));
    for (int i = 0; i < n; ++i) {
        queue<int> que;
        dist[i][i] = 0;
        que.push(i);
        while (!que.empty()) {
            int p = que.front();
            que.pop();
            for (auto& e : edge[p]) {
                if (dist[i][e.second] > dist[i][p] + e.first) {
                    dist[i][e.second] = dist[i][p] + e.first;
                    que.push(e.second);
                }
            }
        }
    }
    vector<long long> dp(n, LM);
    dp[x[0]] = 0;
    for (int i = 1; i < q; ++i) {
        vector<long long> d(n, LM);
        for (int j = 0; j < n; ++j) {
            d[j] = min(d[j], dp[j] + c);
            d[x[i - 1]] = min(d[x[i - 1]], dp[j]);
        }
        dfs(x[i], -1, edge, d);
        for (int j = 0; j < n; ++j) {
            dp[j] = min(dp[j] + min(dist[x[i - 1]][x[i]], c + dist[j][x[i]]), d[j] + dist[j][x[i]]);
        }
    }
    long long ans = LM;
    for (int i = 0; i < n; ++i) {
        ans = min(ans, dp[i]);
    }
    cout << ans << '\n';

    return 0;
}