#include <bits/stdc++.h>
#define rep(i, n) for(long long i = 0; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;

template <class T>
struct Edge {
    int from, to;
    T cost;
    int idx;
    
    Edge() {}
    Edge(int to_) : to(to_) {}
    Edge(int to_, T cost_) : to(to_), cost(cost_) {}
    Edge(int from_, int to_, int idx_) : from(from_), to(to_), idx(idx_) {}
    Edge(int from_, int to_, T cost_, int idx_) : from(from_), to(to_), cost(cost_), idx(idx_) {}
};

template <class T> using Graph = vector<vector<Edge<T>>>;
using graph = Graph<long long>;
using edge = Edge<long long>;

#define add emplace_back

vector<long long> BellmanFord(graph g, int s) {
    int n = g.size();
    long long INF = 1000000000000000000;
    vector<long long> dist(n, INF);
    vector<bool> nega(n, false);
    dist[s] = 0;
    for (int step = 0; step < n - 1; step++) {
        bool update = false;
        for (int u = 0; u < n; u++) {
            if (dist[u] == INF) {
                continue;
            }
            for (auto e : g[u]) {
                int v = e.to;
                long long w = e.cost;
                if (dist[v] > dist[u] + w) {
                    dist[v] = dist[u] + w;
                    update = true;
                }
            }
        }
        if (!update) {
            break;
        }
    }
    for (int step = 0; step < n; step++) {
        for (int u = 0; u < n; u++) {
            if (dist[u] == INF) {
                continue;
            }
            for (auto e : g[u]) {
                int v = e.to;
                long long w = e.cost;
                if (dist[v] > dist[u] + w) {
                    dist[v] = dist[u] + w;
                    nega[v] = true;
                }
                if (nega[u]) {
                    nega[v] = true;
                }
            }
        }
    }
    for (int v = 0; v < n; v++) {
        if (nega[v]) {
            dist[v] = -INF;
        }
    }
    return dist;
}

struct Dijkstra {
    private:
    graph g;
    int n, s;
    vector<long long> d;
    vector<edge> prev;
    vector<bool> visit;
    priority_queue<pair<long long, int>, vector<pair<long long, int>>, greater<pair<long long, int>>> pq;
    
    public:
    Dijkstra(graph g_, int s_) : g(g_), n(g.size()), s(s_), d(n, 1000000000000000000), prev(n), visit(n, false) {
        d[s] = 0LL;
        pq.emplace(d[s], s);
        while (!pq.empty()) {
            int v = pq.top().second;
            pq.pop();
            if (visit[v]) {
                continue;
            }
            visit[v] = true;
            for (auto e : g[v]) {
                int nv = e.to;
                long long nc = e.cost;
                if (d[nv] > d[v] + nc) {
                    d[nv] = d[v] + nc;
                    prev[nv] = e;
                    pq.emplace(d[nv], nv);
                }
            }
        }
    }
    
    vector<long long> dists() {
        return d;
    }
    
    long long dist(int t) {
        return d[t];
    }
    
    vector<edge> route(int t) {
        if (s == t || d[t] == 1000000000000000000) {
            return {};
        }
        vector<edge> res;
        int cur = t;
        while (cur != s) {
            res.emplace_back(prev[cur]);
            cur = prev[cur].from;
        }
        reverse(res.begin(), res.end());
        return res;
    }
};

int main() {
    int n, m, q;
    cin >> n >> m >> q;
    graph g(n);
    vector<edge> es;
    rep(i, m) {
        int u, v;
        lint w;
        cin >> u >> v >> w;
        u--;
        v--;
        w *= -1LL;
        g[u].add(v, w);
        es.emplace_back(u, v, w, i);
    }
    auto p = BellmanFord(g, 0);
    rep(i, n) {
        p[i] *= -1LL;
    }
    vector<int> exist(m, 1);
    while (q--) {
        int j;
        cin >> j;
        j--;
        exist[j] ^= 1;
        graph gg(n);
        rep(i, m) {
            if (exist[i] == 1) {
                auto e = es[i];
                int u = e.from, v = e.to;
                lint w = e.cost;
                w -= p[u] - p[v];
                gg[u].add(v, w);
            }
        }
        lint ans = Dijkstra(gg, 0).dist(n - 1);
        if (ans == 1000000000000000000) {
            cout << "NaN" << endl;
        } else {
            ans -= p[n - 1];
            cout << -ans << endl;
        }
    }
}