#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define endl '\n'
#define pb push_back
#define conts continue
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "YES" << endl
#define no cout << "NO" << endl
#define ff first
#define ss second
#define ceil2(x,y) ((x+y-1) / y)
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#ifndef ONLINE_JUDGE
#define debug(x) cout << #x <<" = "; print(x); cout << endl;
#else
#define debug(x)
#endif
#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
bool iseven(ll n) {if ((n & 1) == 0) return true; return false;}
void print(ll t) {cout << t;}
void print(int t) {cout << t;}
void print(string t) {cout << t;}
void print(char t) {cout << t;}
void print(double t) {cout << t;}
void print(ld t) {cout << t;}
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(pair <T, V> p) {cout << "{"; print(p.ff); cout << ","; print(p.ss); cout << "}";}
template <class T> void print(vector <T> v) {cout << "[ "; for (T i : v) {print(i); cout << " ";} cout << "]";}
template <class T> void print(set <T> v) {cout << "[ "; for (T i : v) {print(i); cout << " ";} cout << "]";}
template <class T> void print(multiset <T> v) {cout << "[ "; for (T i : v) {print(i); cout << " ";} cout << "]";}
template <class T, class V> void print(map <T, V> v) {cout << "[ "; for (auto i : v) {print(i); cout << " ";} cout << "]";}
void usaco(string filename) {
freopen((filename + ".in").c_str(), "r", stdin);
freopen((filename + ".out").c_str(), "w", stdout);
}
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("avx,avx2,sse,sse2,sse3,sse4,popcnt,fma")
const int MOD = 1e9 + 7;
const int maxn = 1e5 + 5;
const int inf1 = 1e9 + 5;
const ll inf2 = 1e18 + 5;
void solve()
{
// https://usaco.guide/problems/noi-knapsack/solution/#explanation
int s, n; cin >> s >> n;
vector< vector<pair<int, int>> > a(s + 5);
rep1(i, n) {
int v, w, k; cin >> v >> w >> k;
a[w].pb({v, k});
}
rep1(i, s) sort(rall(a[i]));
vector<int> val = {0}, weight = {0};
rep1(i, s) {
int cnt = s / i;
vector<pair<int, int>> &v = a[i];
for (auto &p : v) {
while (p.ss--) {
if (cnt <= 0) break;
val.pb(p.ff);
weight.pb(i);
cnt--;
}
}
}
int m = sz(val) - 1;
vector<vector<ll>> dp(m + 5, vector<ll>(s + 5));
rep1(i, m) {
int v = val[i], w = weight[i];
rep(j, s + 1) {
dp[i][j] = dp[i-1][j];
if(j >= w){
dp[i][j] = max(dp[i][j], dp[i-1][j-w] + v);
}
}
}
ll ans = dp[m][s];
cout << ans << endl;
}
int main()
{
fastio;
int t = 1;
// cin >> t;
while (t--) {
solve();
}
return 0;
}
