//SİGUSMUS SEFEROĞLU
#include <bits/stdc++.h>
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
using namespace std;
//#define int int64_t
#define pii pair<int,int>
#define ff first
#define ss second
#define sp << " " <<
#define all(cont) cont.begin(),cont.end()
#define vi vector<int>
const int MOD = 1e9+7,inf = 2e9;
const int N = 1e5+50,Q = 2e5+50;
int alloc[2008];
int ptr = 0;
int sz = 0;
int v[N],c[N],k[N];
int sk[2008],sk1[2008];
signed main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#ifdef Dodi
freopen("in.txt","r",stdin);
freopen("out.txt","w",stdout);
#endif
int n,w;
cin >> w >> n;
for (int i=1;i<=n;i++) cin >> v[i] >> c[i] >> k[i];
int*sack=sk,*sack2=sk1;
for (int i=0;i<=w+1;i++) sack2[i] = -inf;
sack2[0] = 0;
for (int i=1;i<=n;i++) {
for (int jj = 0;jj<c[i];jj++) {
sz = ptr = 0;
for (int j = jj;j<=w;j+=c[i]) {
while (sz && k[i] < (j-alloc[ptr])/c[i]) {
sz--;
ptr++;
}
while (sz && (j-alloc[ptr+sz-1])/c[i]*v[i]+sack2[alloc[sz+ptr-1]] <= sack2[j]) {
sz--;
}
alloc[sz+ptr] = j;
sz++;
sack[j] = (j-alloc[ptr])/c[i]*v[i]+sack2[alloc[ptr]];
}
}
swap(sack,sack2);
}
int ans=0;
for(int i=0;i<=w;i++)if(ans<sack2[i])ans=sack2[i];
cout << ans;
}
