#include <iostream>
#include <vector>
#include <queue>
using namespace std;
using ll = long long;
int main()
{
int s, n; cin >> s >> n;
vector<priority_queue<ll, vector<ll>, greater<ll>>> store(s + 1);
ll v; int w, k;
for(int i = 0; i < n; i++)
{
cin >> v >> w >> k;
int j = min(k, s / w);
while(j > 0)
{
store[w].push(v);
if(store[w].size() > s / w) store[w].pop();
j--;
}
}
vector<int> dp(s + 1, 0);
for(int i = 1; i <= s; i++)
{
while(!store[i].empty())
{
ll u = store[i].top(); store[i].pop();
for(int j = s; j >= i; j--) dp[j] = max(dp[j - i] * 1LL + u, dp[j] * 1LL);
}
}
cout << dp[s] << endl;
}
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