#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
//freopen("knapsack.in","r",stdin);
int s,n; cin>>s>>n;
vector<pair<int,int>> stuff;
vector<vector<pair<int,int>>> gw(s+1);
for (int i=0;i<n;i++) {
int a,b,c; cin>>a>>b>>c;
gw[b].push_back({a,c});
}
for (int i=1;i<=s;i++) sort(gw[i].begin(),gw[i].end());
for (int i=1;i<=s;i++) {
int canchoose=(s/i),pt=0,l=gw[i].size();
while (canchoose>0 && pt<l) {
int sb=min(canchoose,gw[i][pt].second);
canchoose-=sb;
for (int j=0;j<sb;j++) stuff.push_back({gw[i][pt].first,i});
pt++;
}
}
vector<int> dp(s+1,0);
for (auto i:stuff) {
for (int j=s;j>=i.second;j--) dp[j] = max(dp[j],dp[j-i.second]+i.first);
}
cout<<dp[s];
return 0;
}
