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#include <vector>
#include <cstdio>
#include <stack>
#include <algorithm>
#include <queue>
#include <map>
#include <cmath>
#include <unordered_set>
#include <unordered_map>
#include <set>
#include <cstring>
#include <bitset>
#include <iostream>
#include <queue>
#include <iomanip>
#include <complex>

using namespace std;

#define ALL(x) x.begin(), x.end()
#define UNIQUE(c) (c).resize(unique(ALL(c)) - (c).begin())
#define FOR(i, a, b) for(int i =(a); i <=(b); ++i)
#define RE(i, n) FOR(i, 1, n)
#define RED(i, n) FORD(i, n, 1)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define REP(i, n) for(int i = 0;i <(n); ++i)
#define REPD(i, n) FORD(i, n-1,0)

#define printA(a, L, R) FOR(i,L,R) cout << a[i] << (i==R?'\n':' ')
#define printV(a) printA(a,0,a.size()-1)
#define PRESENT(c, x) ((c).find(x) != (c).end())
#define CPRESENT(c, x) (find(ALL(c),x) != (c).end())
#define bit(x, i) (x&(1<<i))
#define lowbit(x) ((x)&((x)^((x)-1)))

const int fx[4][2] = {
    {0, 1},
    {1, 0},
    {0, -1},
    {-1, 0}
};
const int fxx[8][2] = {
    {0, 1},
    {0, -1},
    {1, 0},
    {-1, 0},
    {1, 1},
    {1, -1},
    {-1, 1},
    {-1, -1}
};
const int sk[8][2] = {
    {2, 1},
    {2, -1},
    {-2, -1},
    {-2, 1},
    {1, 2},
    {-1, 2},
    {1, -2},
    {-1, -2}
};

const int maxn = 102;
const long long maxc = 40002, maxc2 = 25002, inf = 1000000001;
long long mod = 998244353ll;

int n, m, r[maxn], va, vb, wag, t[maxn][maxc];
long long res;
vector<pair<int, long long> > v[maxn], vr[maxn];
priority_queue<tuple<int, long long, int>>qp;
set<pair<int, int> > sp[maxn];
queue<pair<long long, int> > q;
int odw[maxn][maxc2], oakt;

void solve() {
    res = -1;
    oakt++;
    cin >> n >> m;
    RE(i, n) cin >> r[i];

    REP(i, m) {
        cin >> va >> vb >> wag;
        v[va].emplace_back(vb, wag);
        vr[vb].emplace_back(va, wag);
    }

    t[n][1] = r[n];
    qp.emplace(r[n], 1, n);
    while (!qp.empty()) {
        auto [prze, mn, a] = qp.top();
        qp.pop();
        if (t[a][mn] != prze)continue;
        for (auto [b, wa]: vr[a]) {
            long long nmn = wa * mn;
            if (nmn < maxc) {
                auto nprze = min(r[b], prze / (int) wa);
                if (t[b][nmn] < nprze) {
                    t[b][nmn] = nprze;
                    qp.emplace(nprze, nmn, b);
                }
            }
        }

    }
    RE(i, n) {
        int lprze = 0;
        REPD(j, maxc)
            if (t[i][j] > lprze) {
                lprze = t[i][j];
                sp[i].emplace(lprze, j);
            }
    }

    q.emplace(1, 1);
    odw[1][1] = oakt;
    if (n == 1)res = 1;
    while (!q.empty()) {
        auto [mn, a] = q.front();
        q.pop();
        for (auto [b, wa]: v[a]) {
            auto nmn = wa * mn;
            if (nmn <= r[b]) {
                if (nmn < maxc2) {
                    if (odw[b][nmn] != oakt) {
                        odw[b][nmn] = oakt;
                        q.emplace(nmn, b);
                    } else {
                        continue;
                    }
                }
                auto it = sp[b].upper_bound({nmn, 0});
                if (it != sp[b].end()) {
                    res = max(res, it->second * nmn);
                }
            }
        }
    }

    RE(i, n) {
        v[i].clear();
        vr[i].clear();
        sp[i].clear();
        REP(j, maxc)t[i][j] = 0;
    }
    cout << res << "\n";
}

int main() {
    ios_base::sync_with_stdio(false), cin.tie(nullptr);

    int tt = 1;
    cin >> tt;
    while (tt--) {
        solve();
    }
    return 0;
}