#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
ios::sync_with_stdio(false); cin.tie(nullptr);
int S, n;
cin >> S >> n;
vector<vector<pair<int, int>>> u(S + 1);
while (n--) {
int v, w, k;
cin >> v >> w >> k;
u[w].push_back({v, k});
}
vector<int> V, W;
for (int i = 1; i <= S; i++) {
if (u[i].empty()) continue;
sort(u[i].rbegin(), u[i].rend());
int s = S / i;
for (auto j : u[i]) {
int mn = min(s, j.second);
while (mn--) {
V.push_back(j.first);
W.push_back(i);
}
s -= mn;
if (!s) break;
}
}
vector<ll> dp(S + 1, -1);
dp[0] = 0;
for (int i = 0; i < (int)V.size(); i++) {
for (int j = S; j >= W[i]; j--)
if (dp[j - W[i]] != -1) dp[j] = max(dp[j], dp[j - W[i]] + V[i]);
}
cout << *max_element(dp.begin(), dp.end());
}
