#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define f first
#define s second
#define chmin(a, b) a = min(a,b)
#define chmax(a, b) a = max(a,b)
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
int main() {
ios::sync_with_stdio(false); cin.tie(0);
int s, n; cin >> s >> n;
int v, w, k;
vector<vector<pii>> in_(s+1);
F0R(i,n) {
cin >> v >> w >> k;
in_[w].pb({v,k});
}
vector<vector<int>> items(s+1);
FOR(i,1,s+1) {
sort(in_[i].begin(),in_[i].end());
int ctr = 0;
for (pii cur : in_[i]) {
F0R(j,min(s/i-ctr,cur.s)) {items[i].pb(cur.f);}
ctr += cur.s;
}
}
vector<ll> dp(s+1,-1);
dp[0] = 0;
FOR(i,1,s+1) { // weight
for (int val : items[i]) {
for (int j=s-i;j>=0;j--) {
if (dp[j]!=-1) {chmax(dp[j+i],dp[j]+val);}
}
}
}
ll ans = 0;
F0R(i,s+1) {chmax(ans,dp[i]);}
cout << ans << '\n';
}
