#include "bits/stdc++.h"
using namespace std;
#define forn for (int i = 0; i < n; i++)
#define int long long
#define ed "\n"
#define cyes cout << "YES\n"
#define cno cout << "NO\n"
#define pb push_back
#define deb cout << "Hi\n"
#define pint pair<int, int>
const long long MOD = 1000000007;
void dbg_out(){cerr<<"\n";}
template<typename Head,typename... Tail>
void dbg_out(Head H,Tail... T){cerr<<' '<<H;dbg_out(T...);}
#define debug(...) cerr<<"("<<#__VA_ARGS__<<"):",dbg_out(__VA_ARGS__)
//-------------------------------------------------------------------------------------------------------------------------------------------------------------------//
int32_t main(){
std::ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int w, n; cin>>w>>n;
vector<array<int, 3>> v(n);
forn cin>>v[i][0]>>v[i][1]>>v[i][2];
vector<pint> v2;
for(auto val: v){
int vi = val[0];
int wi = val[1];
int ki = val[2];
for(int i = 0; i <= 34; i++){
if(ki >= (1LL << i)){
int tt = (1LL << i);
v2.pb({tt*wi, tt*vi});
ki -= tt;
}
}
if(ki > 0) v2.pb({ki*wi, ki*vi});
}
// for(auto val: v2) debug(val.first, val.second);
n = v2.size();
vector<vector<int>> dp(n, vector<int> (w+1, 0));
for(int i = 0; i < n; i++){
for(int j = 1; j <= w; j++){
if(i == 0){
if(j >= v2[i].first) dp[i][j] = v2[i].second;
}
else{
dp[i][j] = dp[i-1][j];
if(j-v2[i].first >= 0) dp[i][j] = max(dp[i][j], dp[i-1][j-v2[i].first] + v2[i].second);
}
}
}
cout << dp[n-1][w] << ed;
}
