#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template <typename T>
using indexed_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define int long long
#define pb push_back
#define ppb pop_back
#define pf push_front
#define ppf pop_front
#define eb emplace_back
#define ins insert
#define F first
#define S second
#define MAXN 1000005
#define LOG (int)log2(MAXN)+1
const int INF = 1e18;
const int MOD = 998244353;
const double EPS = 1e-8;
void solve() {
int S, n;
cin >> S >> n;
vector<int> p, w;
for(int i = 0; i < n; i++){
int x, y, z;
cin >> x >> y >> z;
int c = 1;
while(c<z){
z -= c;
p.pb(c*x);
w.pb(c*y);
c *= 2;
}
p.pb(z*x);
w.pb(z*y);
}
vector<int> dp(S+1, 0);
for(int i = 0; i < p.size(); i++){
for(int j = S; j >= w[i]; j--){
dp[j] = max(dp[j], dp[j-w[i]]+p[i]);
}
}
cout << dp[S] << '\n';
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int t = 1;
// cin >> t;
for(int i = 1; i <= t; i++){
//cout << "Case " << i << ": ";
solve();
}
return 0;
}
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