/*
_.-- ,.--.
.' .' /
@ |'..--------._
/ \._/ '.
/ .-.- \
( / \ \
\\ '. | #
\\ \ -. /
:\ | )._____.' \
" | / \ | \ )
| |./' :__ \.-'
'--'
*/
#include<bits/stdc++.h>
#define ll long long
#define llll pair<int,int>
#define ii pair<int,int>
#define fi first
#define se second
#define FOR(i,l,r) for(int i=l;i<=r;i++)
#define FOD(i,r,l) for(int i=r;i>=l;i--)
#define ull unsigned long long
#define iii pair<int,ii>
#define iv pair<pii,ii>
#define db double
#define ld long double
#define pb push_back
using namespace std;
const int dx[] = {1, -1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int dxx[] = {1, 1, -1, -1, 2, 2, -2, -2};
const int dyy[] = {2, -2, 2, -2, 1, -1, 1, -1};
const ll INF=1e18;
ll s,n,ans;
ll dp[2001];
vector<pair<ll,ll>> vec;
void solve()
{
cin >> s >> n;
for(int i=1;i<=n;i++)
{
ll v,w,k;
cin >> v >> w >> k;
int bp=1;
k=min(k,s/w);
while(k>=bp)
{
vec.pb({w*bp,v*bp});
k-=bp;
bp*=2;
}
if(k)
{
vec.pb({w*k,v*k});
}
}
sort(vec.begin(),vec.end());
vec.erase(unique(vec.begin(),vec.end()),vec.end());
n=vec.size();
for(int i=1;i<=n;i++)
{
// cout << vec[i-1].fi << ' ' << vec[i-1].se << '\n';
for(int j=s;j>=vec[i-1].fi;j--)
{
dp[j]=max(dp[j],dp[j-vec[i-1].fi]+vec[i-1].se);
}
}
for(int i=0;i<=s;i++)
{
ans=max(ans,dp[i]);
}
cout << ans;
}
int main()
{
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
// freopen("tdk.inp","r",stdin);
// freopen("tdk.out","w",stdout);
int t=1;
//cin >> t;
while(t--)
{
solve();
}
return 0;
}
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