#include <bits/stdc++.h>
#define fi first
#define se second
#define pii pair<int, int>
using namespace std;
const int N = 2002;
int S, n;
vector<pii> A[N], V;
long long dp[N];
void Solve() {
cin >> S >> n;
for(int i = 1; i <= n; i++) {
int v, w, k; cin >> v >> w >> k;
A[w].push_back({v, k});
}
for(int i = 1; i <= S; i++) {
int cnt = S / i;
sort(A[i].begin(), A[i].end(), greater<pii>());
for(auto [v, k] : A[i]) {
for(int __ = 1; __ <= min(cnt, k); __++) V.push_back({i, v});
cnt -= min(cnt, k);
if(!cnt) break;
}
}
for(auto [w, v] : V) {
for(int i = S; i >= w; i--) {
dp[i] = max(dp[i], dp[i - w] + v);
}
}
cout << dp[S];
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
Solve();
}
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