//SİGUSMUS SEFEROĞLU
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5+50,inf = 2e9;
const int BUF_SZ=1<<15;
char buf[BUF_SZ];
int pos;
int len;
inline char next_char() {
if (pos == len) {
pos = 0;
len = (int)fread(buf, 1, BUF_SZ, stdin);
if (!len) { return EOF; }
}
return buf[pos++];
}
inline int read_int() {
int x;
char ch=next_char();
x = ch - '0';
while (isdigit(ch = next_char())) { x = x * 10 + (ch - '0'); }
return x;
}
int alloc[2008];
int ptr = 0;
int sz = 0;
int v[N],c[N],k[N];
int sk[2008],sk1[2008],added[2008];
int poss[N];
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 w=read_int(),n=read_int();
for (int i=1;i<=n;i++) v[i]=read_int(),c[i]=read_int(),k[i]=read_int();
iota(poss,poss+n+1,0);
sort(poss+1,poss+n+1,[&](const int& p1,const int& p2){
return v[p1] > v[p2];
});
int*sack=sk,*sack2=sk1;
for (int i=0;i<=w+1;i++) sack2[i] = -inf;
sack2[0] = 0;
for (int ii=1;ii<=n;ii++) {
int i = poss[ii];
if(w<=added[c[i]]*c[i])continue;
added[c[i]]+=k[i];
for (int jj = 0;jj<c[i];jj++) {
sz = ptr = 0;
for (int j = jj;j<=w;j+=c[i]) {
if (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;
}
