#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<ll> vl;
#define optimize() ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define PB push_back
int main() {
optimize();
int S, N;
cin >> S >> N;
vector<vector<pair<ll, ll>>> by_weight(S + 1);
for (int i = 0; i < N; ++i) {
ll v, w, k;
cin >> v >> w >> k;
by_weight[w].emplace_back(v, k);
}
vl dp(S + 1, 0);
for (int w = 1; w <= S; ++w) {
if (by_weight[w].empty()) continue;
for (auto [v, k] : by_weight[w]) {
for (ll t = 1; k > 0; t <<= 1) {
ll use = min(t, k);
k -= use;
ll tv = v * use;
ll tw = w * use;
for (int j = S; j >= tw; --j) {
dp[j] = max(dp[j], dp[j - tw] + tv);
}
}
}
}
cout << dp[S] << '\n';
return 0;
}
