#include <bits/stdc++.h>
#define FastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define ll long long
#define PB push_back
#define ALL(v) (v).begin(), (v).end()
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define fi first
#define se second
#define BIT(x, i) (((x) >> (i)) & 1)
using namespace std;
/** END OF TEMPLATE **/
const int mxN = 1e5 + 5;
struct item {
ll v, w;
};
ll n, s, dp[2005];
int main()
{
FastIO;
//freopen(".inp", "r", stdin);
//freopen(".out", "w", stdout);
cin >> s >> n;
vector<item> a;
FOR(i, 1, n) {
ll v, w, cnt;
cin >> v >> w >> cnt;
ll t = 1;
while(cnt >= t) {
if(t*w <= s) a.PB({t*v, t*w});
cnt -= t;
t <<= 1;
}
if(cnt) if(cnt*w <= s) a.PB({cnt*v, cnt*w});
}
FOR(i, 0, a.size()-1) {
FORD(j, s, a[i].w)
dp[j] = max(dp[j], dp[j - a[i].w] + a[i].v);
}
cout << dp[s];
return 0;
}
/*
*/
