#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using vi = vector<int>;
#define all(x) (x).begin(), (x).end()
ll dp[2001];
int main() {
cin.tie(0);
cout.tie(0);
ios_base::sync_with_stdio(0);
int s, n;
cin >> s >> n;
vector<ll> v, w;
ll x, y, z;
for (int i = 0; i < n; ++i) {
cin >> x >> y >> z;
ll c = 1;
while (c < z) {
if (y * c > s) {
c *= 2;
break;
}
v.push_back(x * c);
w.push_back(y * c);
z -= c;
c *= 2;
}
if (z > 0) {
if (y * z > s) continue;
v.push_back(x * z);
w.push_back(y * z);
}
}
for (int i = 0; i < v.size(); ++i) {
for (int j = s; j >= w[i]; --j) {
dp[j] = max(dp[j], dp[j - w[i]] + v[i]);
}
}
cout << dp[s] << '\n';
return 0;
}
