#include <bits/stdc++.h>
using namespace std;
#define int long long
const long long inf=1e18;
int dp[2007];
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie();
int m,n;
cin>> m>>n;
bool ok = 0 ;
if(n == 1) {
ok = 1 ;
}
int a[n+1],b[n+1];
vector<int>v1,v2,k;
for(int i=1,count;i<=n;i++){
cin>> b[i]>>a[i]>>count;
if(ok) {
int s = m / a[i] ;
if(s >= count) {
cout << b[i] * count ;
}
else {
cout << b[i] * s ;
}
return 0;
}
k.push_back(count);
for(int j=0;j<min(count,m);j++){
v1.push_back(a[i]);
v2.push_back(b[i]);
}
}
dp[0]=0;
for(int i=0;i<v1.size();i++){
for(int j=m;j>=v1[i];j--){
dp[j]=max(dp[j],dp[j-v1[i]]+v2[i]);
}
}
cout<< dp[m];
}
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