#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int s, n;
cin >> s >> n;
vector<pair<int, long long>> cc;
for (int i = 0; i < n; i++) {
int r, v, k;
cin >> r >> v >> k;
for (int i = 0; i < 30; i++) {
k -= (1 << i);
if (k < 0) {
k += (1 << i);
break;
}
if ((1LL << i) * v <= s) {
cc.push_back({(1 << i) * v, (1LL << i) * r});
}
}
if (k && (long long) k * v <= s) {
cc.push_back({k * v, (long long) k * r});
}
}
sort(cc.begin(), cc.end(), [&](const auto &x, const auto &y) {
return (__int128) x.second * y.first > (__int128) y.second * x.first;
});
vector<long long> dp(s + 1);
for (int i = 0; i < min(120000, (int) cc.size()); i++) {
auto [x, y] = cc[i];
for (int j = s; j >= x; j--) {
dp[j] = max(dp[j], dp[j - x] + y);
}
}
cout << dp[s] << '\n';
return 0;
}
