#include <bits/stdc++.h>
#define pii pair<int,int>
#define pb push_back
#define yes "YES"
#define no "NO"
#define ll long long
#define MOD 1000000007
#define all(x) x.begin(),x.end()
#define MOD2 998244353
using namespace std;
void solve(int cas){
ll s,n; cin>>s>>n;
vector<vector<ll>> nums(s+1);
for (int i = 0; i < n; i++){
ll v,w,k; cin>>v>>w>>k;
for (int j = 0; j < min(s, k); j++){
nums[w].emplace_back(v);
}
}
for (int i = 0; i <= s; i++){
sort(nums[i].rbegin(), nums[i].rend());
}
ll dp[s+2][s+1];
memset(dp, 0, sizeof dp);
for (int i = s; i >= 0; i--){
for (int weight = 0; weight <= s; weight++){
dp[i][weight] = dp[i+1][weight];
int p = 0;
ll sm = weight, add = 0;
while (p < nums[i].size() && sm <= s){
sm += i;
add += nums[i][p];
p++;
if (sm <= s){
dp[i][weight] = max(dp[i][weight], add + dp[i+1][sm]);
}
}
}
}
cout << dp[1][0] << '\n';
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int t = 1;
//cin>>t;
for (int i = 1; i <= t; i++){
solve(i);
}
return 0;
}
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