#include<bits/stdc++.h>
using namespace std;
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
int S,N;
cin>>S>>N;
long long dp[2001];
for(int i=0;i<=S;i++)
{
dp[i]=0;
}
for(int i=1;i<=N;i++)
{
long long V,W,K;
cin>>V>>W>>K;
long long c=1;
while(K>0)
{
long long t=min(c,K);
long long wt=t*W;
long long val=t*V;
if(wt<=S)
{
for(int s=S;s>=wt;s--)
{
dp[s]=max(dp[s],dp[s-wt]+val);
}
}
K-=t;
c<<=1;
}
}
long long r=0;
for(int i=0;i<=S;i++)
{
r=max(r,dp[i]);
}
cout<<r;
return 0;
}
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