#include<bits/stdc++.h>
using namespace std;
//\\ PRINCIPAL \\//
#define int long long
#define mod 800000007
#define ios ios_base::sync_with_stdio(0); cin.tie(0),cout.tie(0)
//\\ STL \\//
#define pb push_back
#define fr first
#define sc second
#define all(x) x.begin(), x.end()
int32_t main() {
ios;
int s,n;
cin >> s >> n;
vector< pair< int, pair< int,int> > >v(n);
vector< pair< int, pair< int,int> > >v2;
for(int l = 0; l < v.size(); l++)
{
cin >> v[l].fr >> v[l].sc.fr >> v[l].sc.sc;
if(v[l].sc.sc > s)v[l].sc.sc = s;
pair< int, pair< int,int> > i = v[l];
int aux = i.sc.sc;
for(int j = 0; j < 13; j++)
{
int aux2 = (1 << j);
if(aux >= aux2)
{
v2.pb({i.fr * aux2,{i.sc.fr * aux2,1}});
aux -= aux2;
}
}
if(aux == 0)continue;
v2.pb({i.fr * aux,{i.sc.fr * aux,1}});
}
vector<int>dp(s + 1,0);
int maxx=0;
for(pair< int, pair< int,int> > i : v2)
{
for(int j = s; j >= i.sc.fr; j--)
{
dp[j] = max(dp[j],dp[j - i.sc.fr] + i.fr);
maxx = max(maxx,dp[j]);
}
}
cout << maxx << endl;
return 0;
}
