#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
typedef long long ll;
using namespace __gnu_pbds;
#define endl '\n'
#define hitaf ios_base::sync_with_stdio(false); cin.tie(0);
#define fi first
#define se second
template <typename T>
using ordered_set = tree<T,null_type,less<T>,rb_tree_tag, tree_order_statistics_node_update>;
const ll MOD1 = 1e9 + 7;
const ll MOD = 998244353;
const ll INF = 4500000000000000000LL;
const ll mod1 = 6900000469;
const ll mod2 = 698000002369;
const int block = 447;
ll n, m, k, q, a[1200005], b[500005], c[500005];
string s, s1, s2;
int main(){
hitaf
int T = 1;
// cin >> T;
while(T--){
cin >> m >> n;
for(int i = 1; i <= n; i++) cin >> a[i] >> b[i] >> c[i];
vector<vector<ll>> dp(n + 2, vector<ll>(m + 2, -INF));
dp[0][0] = 0;
for(int i = 1; i <= n; i++){
for(int j = 0; j <= m; j++){
dp[i][j] = dp[i - 1][j];
for(int k = b[i], val = a[i]; k <= j && k <= c[i] * b[i]; k += b[i], val += a[i]){
dp[i][j] = max(dp[i][j], dp[i - 1][j - k] + val);
}
}
}
ll maks = 0;
for(int j = 0; j <= m; j++) maks = max(maks, dp[n][j]);
cout << maks << endl;
}
}
