#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,fma")
 
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
const int MAX = 2002;
vector<pair<ll, ll>> a[MAX];
ll f[MAX][MAX], s, n, u, v, w, k, total;
 
void solve() {
    cin >> s >> n;
    for (int i = 1; i <= n; i++) {
        cin >> v >> w >> k;
        a[w].push_back({v, k});
    }
    for (int i = 1; i <= 2000; i++) sort(a[i].begin(), a[i].end(), greater<pair<ll, ll>>());
    for (int i = 1; i <= s; i++) {
        for (int j = 1; j <= s; j++) {
            total = 0;
            ll temp = 0;
            f[i][j] = f[i - 1][j];
            for (auto u : a[i]) {
                if (total + u.second * i <= j) {
                    total += u.second * i;
                    temp += u.second * u.first;
                    f[i][j] = max(f[i][j], temp + f[i - 1][j - total]);
                } else {
                    temp += (j - total) / i * u.first;
                    total += (j - total) / i * i;
                    f[i][j] = max(f[i][j], temp + f[i - 1][j - total]);
                    break;
                }
            }
            f[i][j] = max(f[i][j], temp + f[i - 1][j - total]);
            //if (i > 19) cout << f[i][j] << " ";
        }
        //if (i > 19) cout << "\n";
    }
    cout << f[s][s];
}
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    solve();
}