#include <bits/stdc++.h>
using namespace std;
#define sped ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define pb push_back
#define s second
#define f first
#define int long long
void okok(){
int n,s;
cin >> s >> n;
vector < int > dp(s + 1,-1e18);
vector< pair<int,int> > g[2010];
for(int i = 1;i <= n;i++){
int v,w,k;
cin >> v >> w >> k;
g[w].pb({v,k});
}
for(int i = 1;i <= s;i++){
sort(g[i].begin(),g[i].end());
}
dp[0] = 0;
for(int i = 1;i <= s;i++){
int c = 0;
for(int k = 1;k <= s / i;k++){
if(g[i].size() == 0) {break;}
c++;
for(int j = s;j >= i;j--){
if(dp[j - i] == -1e18) continue;
dp[j] = max(dp[j],dp[j - i] + g[i][g[i].size() - 1].f);
}
g[i][g[i].size() - 1].s--;
if(g[i][g[i].size()-1].s == 0) g[i].pop_back();
}
}
int mx = 0;
for(int i = 1;i <=s;i++){
mx = max(dp[i],mx);
}
cout << mx;
}
signed main() {
sped
int tt = 1;
//cin >> tt;
while(tt--){
okok();
cout << '\n';
}
}
