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// clang-format off
#include <bits/stdc++.h>

using namespace std;

#define ALL(x) (x).begin(), (x).end()

template<class C> void mini(C &a5, C b5) { a5 = min(a5, b5); }
template<class C> void maxi(C &a5, C b5) { a5 = max(a5, b5); }

#ifdef LOCAL
const bool debug = true;
#else
const bool debug = false;
#define cerr if (true) {} else cout
#endif
// clang-format on

#define int long long
#define double long double

const int INF = 1e18;
const int mod = 1e9 + 7;
const int NAX = 110;
const int IAX = 32000;

bool dp[NAX][IAX];
int dk[NAX][IAX];
int dp2[NAX][IAX];
int p[NAX];

struct Edge {
    int u, v, w;
};
vector<Edge> edges;

struct QueueNode {
    int u, iloczyn, lim;

    bool operator<(const QueueNode &other) const {
        if (iloczyn == other.iloczyn)
            return lim > other.lim;
        return iloczyn < other.iloczyn;
    }

    void print() { cout << u << " " << iloczyn << " " << lim << "\n"; }
};

void dfs_dp(int n) {
    dp[1][1] = true;

    vector<vector<pair<int, int>>> drogi(n + 10);
    for (Edge &edge : edges)
        drogi[edge.u].push_back({edge.v, edge.w});

    priority_queue<QueueNode> q;
    q.push({1, 1, true});
    while (!q.empty()) {
        QueueNode curr = q.top();
        q.pop();

        for (auto [v, w] : drogi[curr.u]) {
            QueueNode candidate = {v, curr.iloczyn * w, true};
            if (candidate.iloczyn >= IAX || candidate.iloczyn > p[v])
                continue;
            if (dp[v][candidate.iloczyn] == false) {
                dp[v][candidate.iloczyn] = true;
                q.push(candidate);
            }
        }
    }
}

void dfs_dk(int n) {
    dk[n][1] = p[n];

    vector<vector<pair<int, int>>> drogi(n + 10);
    for (Edge &edge : edges)
        drogi[edge.v].push_back({edge.u, edge.w});

    priority_queue<QueueNode> q;
    q.push({n, 1, p[n]});
    while (!q.empty()) {
        QueueNode curr = q.top();
        q.pop();

        if (dk[curr.u][curr.iloczyn] != curr.lim)
            continue;

        for (auto [v, w] : drogi[curr.u]) {
            QueueNode candidate = {v, curr.iloczyn * w,
                                   min(curr.lim / w, p[v])};
            if (candidate.iloczyn >= IAX)
                continue;
            if (dk[v][candidate.iloczyn] < candidate.lim) {
                dk[v][candidate.iloczyn] = candidate.lim;
                q.push(candidate);
            }
        }
    }
}

void debug_print(int n) {
    cout << "dp:\n";
    for (int i = 1; i <= n; i++) {
        cout << i << ": ";
        for (int ilo = 1; ilo < IAX; ilo++)
            if (dp[i][ilo])
                cout << ilo << "," << dp[i][ilo] << " ";
        cout << "\n";
    }
    cout << "dk:\n";
    for (int i = 1; i <= n; i++) {
        cout << i << ": ";
        for (int ilo = 1; ilo < IAX; ilo++)
            if (dk[i][ilo])
                cout << ilo << "," << dk[i][ilo] << " ";
        cout << "\n";
    }
    cout << "dp2:\n";
    for (int i = 1; i <= n; i++) {
        cout << i << ": ";
        for (int ilo = 1; ilo < IAX; ilo++)
            if (dp2[i][ilo])
                cout << ilo << "," << dp2[i][ilo] << " ";
        cout << "\n";
    }
    cout << "\n";
}

void solve() {
    edges.clear();
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++)
        cin >> p[i];
    for (int i = 0; i < m; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        edges.push_back({u, v, w});
    }

    for (int i = 0; i <= n; i++)
        for (int j = 0; j < IAX; j++)
            dp[i][j] = dk[i][j] = dp2[i][j] = 0;

    dfs_dp(n);
    dfs_dk(n);
    for (int u = 1; u <= n; u++)
        for (int ilo = 1; ilo < IAX; ilo++)
            if (dp[u][ilo])
                dp2[u][ilo] = ilo;
            else
                dp2[u][ilo] = dp2[u][ilo - 1];
    // debug_print(n);

    int res = 0;
    if (dp[n][1])
        res = 1;
    for (Edge &edge : edges)
        for (int ilo = 1; ilo < IAX; ilo++) {
            int ilo_p = min(dk[edge.v][ilo] / edge.w, IAX - 1);
            ilo_p = dp2[edge.u][ilo_p];
            maxi(res, ilo_p * edge.w * ilo);
        }

    if (res == 0)
        res = -1;
    cout << res << "\n";
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int t;
    cin >> t;
    while (t--) {
        solve();
    }

    return 0;
} /*

 */