#include <bits/stdc++.h>
using namespace std;
#define int long long
// #define endl '\n'
#define ff first
#define ss second
#define pb push_back
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define ar array
const int MOD = 1e9 + 7,INF = 1e18, N = 2e5 + 5;
/*
*/
void solve(){
int s , n;
cin >> s >> n;
vector <pair<int,int>> a;
for(int i = 0;i < n;i++){
int v , w , k;
cin >> v >> w >> k;
int h = 1;
while(k > 0){
int x = min(k , h);
a.pb({v * x , w * x});
k -= x;
x *= 2;
}
}
vector <int> dp(2001, 0);
dp[0] = 0;
for(int i = 0;i < (int)a.size();i++){
for(int j = 2000;j >= a[i].ss;j--){
dp[j] = max(dp[j] , dp[j - a[i].ss] + a[i].ff);
}
}
// for(int i = 0;i <= s;i++){
// cout<<dp[i]<<' ';
// }
// cout<<endl;
int ans = 0;
for(int i = 0;i <= s;i++){
ans = max(ans , dp[i]);
}
cout<<ans<<endl;
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int ti = 1;
// cin >> ti;
while (ti--) {
solve();
}
}
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