#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define INF (long long)(2e9)
#define mod2 998244353
#define mod 1000000007
#define eps 1e-9
#define abs(x) ((x)>=0?(x):-(x))
#define y1 solai
#define fi first
#define se second
typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pll;
typedef pair<double,double> pdd;
typedef pair<pll, ll> plll;
mt19937 rng(29);
const ll N=2100;
ll n,ch=1,ans;
struct point
{
ll x,y,w;
}a[N];
bool cmp_x(point a, point b)
{
return a.x<b.x;
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cin>>n;
for(ll i=1;i<=n;i++)
{
cin>>a[i].x>>a[i].y>>a[i].w;
ch&=a[i].y==0;
}
ch=1;
if(ch)
{
sort(a+1,a+n+1,&cmp_x);
for(ll i=1;i<=n;i++)
{
ll sum=0;
for(ll j=i;j<=n;j++)
sum+=a[j].w,ans=max(ans,sum);
}
cout<<ans;
return 0;
}
}
/*
5
-5 0 -2
-2 0 7
1 0 -2
2 0 10
4 0 4
*/
