#include <bits/stdc++.h>
// #ifndef ONLINE_JUDGE
// #include <debug.h>
// #else
// #define debug(...)
// #endif
#define GOOD_LUCK ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define int long long
#define endl "\n"
#define ff first
#define ss second
#define pb push_back
#define all(v) v.begin(), v.end()
using namespace std;
constexpr int MAX = 2e+5 + 1, INF = 2e+16, MOD = 1e+9 + 7, K = 31;
void _() {
int s, n;
cin >> s >> n;
vector <array <int, 3>> v(n);
vector <pair<int, int>> a;
for (auto &i : v) {
cin >> i[0] >> i[1] >> i[2];
int rem = i[2];
for (int j = 1; rem > 0; j *= 2) {
int c = min(rem, j);
a.pb({c * i[0], c * i[1]});
rem -= c;
}
}
vector <int> dp(s + 1, -INF);
dp[0] = 0;
for (auto &j : a) {
for (int i = s; i >= 0; i--) {
if (i - j.ss < 0) continue;
dp[i] = max(dp[i], dp[i-j.ss] + j.ff);
}
}
cout << *max_element(all(dp));
}
signed main() {
GOOD_LUCK
int tests=1;
// cin >> tests;
for (int i=1; i <= tests; i++) {
_();
cout << endl;
}
return 0;
}
