#include<bits/stdc++.h>
using namespace std;
#include<ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T> using Tree = tree<T, null_type, less<T>,
rb_tree_tag, tree_order_statistics_node_update>;
#define ook order_of_key
#define fbo find_by_order
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vpii;
typedef vector<long long> vll;
#define PI acos(-1.0)
#define EPS 1e-9
#define INF 1000000000
#define setbits(x) __builtin_popcountll(x)
#define zrobits(x) __builtin_ctzll(x)
#define pb push_back
#define mkp make_pair
#define sqr(a) ((a) * (a))
#define sz(a) int((a).size())
#define all(a) (a).begin(), (a).end()
#define forn(i, n) for (int i = 0; i < int(n); ++i)
#define FOR(i, l, r) for(int i=int(l); i<=int(r); i++)
#define ROF(i, l, r) for(int i=int(r); i>=int(l); --i)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MOD = 1e9+7;
void print_out(int x){
cout<<"Case #"<<x<<": ";
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n, S; cin>>S>>n;
vector<vector<pair<ll, ll>>> V(S+2);
vll K(S+2, 0);
FOR(i, 0, n-1){
ll v, w, k;cin>>v>>w>>k;
V[w].pb({v, k});
K[w]+=k;
}
for(int i=0; i<=S; i++){
if(!V[i].empty())sort(all(V[i]), [&](pair<ll, ll>& x, pair<ll, ll>& y){return x.first>y.first;});
for(int j=1; j<sz(V[i]); j++){
V[i][j].second += V[i][j-1].second;
}
}
vll dp(S+2, 0);
for(int i=1; i<=S; i++){
for(int x=S; x>=0; x--){
ll val = 0;int ptr = 0;
for(int k=1; k<=K[i]; k++){
if(x+k*i>S)break;
if(k>V[i][ptr].second)ptr++;
if(ptr>=sz(V[i]))break;
val += V[i][ptr].first;
dp[x+k*i] = max(dp[x+k*i], dp[x]+val);
}
}
}
ll ans = 0;
for(int x=S; x>=0; x--){
ans = max(ans, dp[x]);
}
cout<<ans<<"\n";
return 0;
}
