#include <bits/stdc++.h>
using namespace std;
deque < pair <int , int> > candidati[2001];
int maxim[2001] , temporar[2001];
int main ()
{
ios :: sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
int limita , optiuni;
cin >> limita >> optiuni;
for (int indice = 1 ; indice <= limita ; indice++)
{ maxim[indice] = -1; }
while (optiuni--)
{
int valoare , greutate , __limita;
cin >> valoare >> greutate >> __limita;
for (int indice = 0 ; indice < greutate ; indice++)
{ candidati[indice].clear(); }
for (int indice = 0 , __indice = 0 ; indice <= limita ; indice++)
{
if (!candidati[__indice].empty() && (indice - candidati[__indice].front().second) / greutate > __limita)
{ candidati[__indice].pop_front(); }
temporar[indice] = max(maxim[indice] , candidati[__indice].empty() ? -1 : candidati[__indice].front().first + indice / greutate * valoare);
if (maxim[indice] != -1)
{
pair <int , int> actual = {maxim[indice] - indice / greutate * valoare , indice};
while (!candidati[__indice].empty() && candidati[__indice].back().first <= actual.first)
{ candidati[__indice].pop_back(); }
candidati[__indice].push_back(actual);
}
if (++__indice == greutate)
{ __indice = 0; }
}
for (int indice = 0 ; indice <= limita ; indice++)
{ maxim[indice] = temporar[indice]; }
}
int rezultat = 0;
for (int indice = 1 ; indice <= limita ; indice++)
{ rezultat = max(rezultat , maxim[indice]); }
cout << rezultat;
return 0;
}
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