#include <bits/stdc++.h>
using namespace std;
#define sz(x) (int)x.size()
#define MASK(i) ((1LL) << (i))
#define all(x) x.begin(), x.end()
#define BIT(x, i) ((x) >> (i) & (1LL))
#define dbg(...) cerr << "#" << __LINE__ << ":[" << #__VA_ARGS__ \
<< "] = [" ,DBG(__VA_ARGS__)
string to_string(const string& s) { return '"' + s + '"'; }
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
cerr << to_string(h); if(sizeof...(t)) cerr << ", "; DBG(t...);
}
template <class T>
inline bool maximize(T &a, const T &b) { return (a < b ? (a = b) : 0); }
template <class T>
inline bool minimize(T &a, const T &b) { return (a > b ? (a = b) : 0); }
const int MAXN = 1e5 + 6;
const int INF = 1e9;
const int MOD = 1e9 + 7;
int n, s;
int64_t f[2005];
vector<pair<int64_t, int64_t>> a[MAXN];
void solve() {
cin >> s >> n;
for (int i = 1; i <= n; i++) {
int v, w, k;
cin >> v >> w >> k;
int sum = 0;
for (int j = 0; j <= 11; j++) {
if (k >= MASK(j)) {
a[i].push_back({1LL * w * MASK(j), 1LL * v * MASK(j)});
k -= MASK(j);
sum += MASK(j);
if (sum > s) break;
}
}
if (sum < s && k > 0) a[i].push_back({1LL * k * w, 1LL * k * v});
}
for (int i = 1; i <= n; i++) {
for (auto it : a[i]) {
for (int k = s; k >= it.first; --k)
maximize(f[k], f[k - it.first] + it.second);
}
}
cout << f[s];
}
#define TASK "ALLOW"
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
// freopen(TASK".inp", "r", stdin);
// freopen(TASK".out", "w", stdout);
int ntest = 1;
//cin >> ntest;
while (ntest--) solve();
return 0;
}
//612
