#include <bits/stdc++.h>
using namespace std;
const int mxN = 1e5+5;
const int M = 1e9+7;
using vi = vector<int>;
#define ll long long
#define f first
#define s second
#define pii pair<int,int>
#define pb push_back
#define mp make_pair
#define el '\n'
ll s,n, a[mxN], b[mxN], c[mxN], dp[mxN][2005];
void solve() {
cin >> s >> n;
for (int i = 1; i <= n; ++i) cin >> b[i] >> a[i] >> c[i];
for (int i = 1; i <= n; ++i) {
for (int w = 1; w <= s; ++w) {
for (int j = 0; j <= c[i]; ++j) {
if (j*a[i] <= w) dp[i][w] = max(dp[i][w], dp[i][w - j*a[i]] + j * b[i]);
}
}
}
cout << dp[n][s];
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int t;
// cin >> t;
t = 1;
while(t--) {
solve();
}
return 0;
}
