#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
#define fi first
#define se second
#define pb push_back
#define TC int t; cin>>t; while(t--)
#define all(x) (x).begin(),(x).end()
//*AC BERSAMA ALLAH FORTIS FORTUNA ADIUVAT
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int energi,tipe;
cin>>energi>>tipe;
vector<pair<pair<ll,ll>,ll > > v(tipe+1);
ll dp[tipe+1][energi+1]; memset(dp,0,sizeof(dp));
for(int i=1;i<=tipe;i++){
ll l,e,k;
cin>>l>>e>>k;
v[i]=make_pair(make_pair(l,e),k); // luas, energi, kuantiti
}
for(int i=1;i<=tipe;i++){
for(int j=1;j<=energi;j++){
dp[i][j]=dp[i-1][j];
ll kuant=v[i].se, en=v[i].fi.se;
for(int k=1;k<=kuant;k++){
if(j>=en*k){
if(dp[i-1][j-k*en]+k*v[i].fi.fi>=dp[i][j]){
dp[i][j]=dp[i-1][j-k*en]+k*v[i].fi.fi;
}
else break;
}
else break;
}
}
}
cout<<dp[tipe][energi]<<'\n';
return 0;
}
