#include <bits/stdc++.h>
#define st first
#define nd second
using lint = int64_t;
constexpr int mod = int(1e9) + 7;
constexpr int inf = 0x3f3f3f3f;
constexpr int ninf = 0xcfcfcfcf;
constexpr lint linf = 0x3f3f3f3f3f3f3f3f;
const long double pi = acosl(-1.0);
// Returns -1 if a < b, 0 if a = b and 1 if a > b.
int cmp_double(double a, double b = 0, double eps = 1e-9) {
return a + eps > b ? b + eps > a ? 0 : 1 : -1;
}
using namespace std;
template<typename T, T (*op)(const T&, const T&)> struct monotonic_queue {
vector<T> as, aas;
vector<T> bs, bbs;
void reserve(int N) {
as.reserve(N); aas.reserve(N);
bs.reserve(N); bbs.reserve(N);
}
void reduce() {
while (!bs.empty()) {
as.push_back(bs.back());
aas.push_back(aas.empty() ? bs.back() : op(bs.back(), aas.back()));
bs.pop_back(); bbs.pop_back();
}
}
T get() {
if (as.empty()) reduce();
return (bbs.empty() ? aas.back() : op(aas.back(), bbs.back()));
}
bool empty() const { return (as.empty() && bs.empty()); }
int size() const { return int(as.size()) + int(bs.size()); }
T front() {
if (as.empty()) reduce();
return as.back();
}
void push(const T& val) {
bs.push_back(val);
bbs.push_back(bbs.empty() ? val : op(bbs.back(), val));
}
void pop() {
if (as.empty()) reduce();
as.pop_back();
aas.pop_back();
}
};
// min/max
template<typename T> T mapping_max(const T& a, const T& b) {
return max(a, b);
}
template<typename T> using max_queue = monotonic_queue<T, mapping_max>;
int main() {
cin.tie(nullptr)->sync_with_stdio(false);
//ifstream cin;
//cin.open("feast.in");
//ofstream cout;
//cout.open("feast.out");
int s, n;
cin>>s>>n;
vector<int>v(n), w(n), k(n);
for(int i=0;i<n;i++) cin>>v[i]>>w[i]>>k[i];
for(int i=0;i<n;i++) k[i] = min(k[i], s);
vector<vector<int>>dp(n+1, vector<int>(s+1));
for(int i=0;i<n;i++){
for(int j=0;j<w[i];j++){
max_queue<int>q;
for(int l=j,c=0;l<=s;l+=w[i],c++){
q.push(dp[i][l] - c * v[i]);
dp[i+1][l] = q.get() + c * v[i];
if(c >= k[i]) q.pop();
}
}
}
int ans = 0;
for(int j=0;j<=s;j++) ans = max(ans, dp[n][j]);
cout<<ans<<"\n";
}
/*
[ ]Leu o problema certo???
[ ]Ver se precisa de long long
[ ]Viu o limite dos fors (é n? é m?)
[ ]Tamanho do vetor, será que é 2e5 em vez de 1e5??
[ ]Testar sample
[ ]Testar casos de borda
[ ]1LL no 1LL << i
[ ]Testar mod (é 1e9+7, mesmo?, será que o mod não ficou negativo?)
*/
