#include<iostream>
#include<algorithm>
#include <cmath>
using namespace std;
const int MAXN = 100000;
const int MAXC = 1000;
int main(){
int C;
int n;
cin >> C >> n;
int V[n];
int W[n];
long int B[n];
for (int i = 0; i < n; i++){
cin >> V[i] >> W[i] >> B[i];
}
if(n == 1){
if(V[0] <= C){
cout << V[0] << endl;
}
else{
cout << 0 << endl;
}
return 0;
}
vector<long> NW, NV;
long int M = 0;
// vamos criar os novos itens (pacotes)
for (int i = 0; i < n; ++i ){
if(B[i] > 1){
int pos = 0;
// procuramos o bit mais significativo
while ( (1 << pos) < B[i] ){
pos++;
}
// aqui sabemos que (2 ^ pos) >= B[i]
pos--;
// agora 2 ^ pos < B[i], logo (2 ^ pos) - 1 <= B[i]
while ( pos >= 0 ){
NW.push_back((1 << pos) * W[i]);
NV.push_back((1 << pos) * V[i]);
B[i] -= (1 << pos);
M++;
pos--;
}
if ( B[i] ){ // se sobrou um resto
NW.push_back(B[i] * W[i]);
NV.push_back(B[i] * V[i]);
M++;
B[i] = 0;
}
} else {
NW.push_back(W[i]);
NV.push_back(V[i]);
M++;
B[i] = 0;
}
}
long int dp[2][C+1];
int prev = 0, act = 1;
// caso base : quando nao temos mais itens
for ( int c = 0; c <= C; ++c )
dp[prev][c] = 0;
for ( int i = NW.size(); i >= 0; --i ){
for ( int c = 0; c <= C; ++c ){
dp[act][c] = dp[prev][c];
if ( NW[i] <= c ) {
dp[act][c] = max( dp[act][c], dp[prev][c - NW[i]] + NV[i] );
}
}
swap( act, prev );
}
cout << dp[prev][C] << endl;
return 0;
}
