#include <bits/stdc++.h>
#define IO ios::sync_with_stdio(false);cin.tie(0);
#define debug(x) cerr << #x << " = " << (x) << ' '
#define bug(x) cerr << (x) << ' '
#define endl cerr << '\n'
#define all(v) (v).begin(), (v).end()
#define SZ(v) (ll)(v).size()
#define lowbit(x) (x)&-(x)
#define pb emplace_back
#define F first
#define S second
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
//#define TEST
const int N = 1e5+5;
ll wei, val, num, dp[2005];
int main(void)
{ IO
int n, i, T;
cin >> T >> n;
for (i=1; i <= n; ++i)
{
cin >> val >> wei >> num;
for (int j=1; num > 0; j <<= 1)
{
int tmp = min((ll)j, num);
num -= tmp;
for (int k=T; k >= tmp*wei; --k)
dp[k] = max(dp[k], dp[k-wei*tmp] + val*tmp);
}
}
cout << dp[T] << '\n';
return 0;
}
