#include <iostream>
using namespace std;

const int N = 30003, M = 100009;
int n, s[N], t[N], v[N];

// 按結(jié)束時(shí)間從小到大排序
int x, y, z;
void QSort( int b, int e );          // t <= <=

// 求前 time 時(shí)間，前 j 個(gè)零件最優(yōu)值 
// 最優(yōu)解為 f[t[n]] 
const int OO = 2123456789;
int f[M];
int Dp( void );

int main(){
    int i;
    cin >>n;
    for( i=1; i<=n; ++i )
         cin >>s[i] >>t[i] >>v[i];
    
    srand(time(NULL));
    QSort( 1, n );
    
    cout <<Dp() <<endl;
    
    system( "pause" );
    return 0;
}

void QSort( int b, int e ){
     int i, j;
     j = rand()%(e-b+1) + b;
     x = s[j];    y = t[j];    z = v[j];
     s[j] = s[b]; t[j] = t[b]; v[j] = v[b];
     i = b; j = e;
     while( i<j ){
            while( (i<j) && (y<=t[j]) ) --j;
            if( i<j ){
                s[i] = s[j]; t[i] = t[j]; v[i] = v[j]; ++i;
            }
            while( (i<j) && (t[i]<=y) ) ++i;
            if( i<j ){
                s[j] = s[i]; t[j] = t[i]; v[j] = v[i]; --j;
            }
     }
     s[i] = x; t[i] = y; v[i] = z;
     if( b<i-1 ) QSort( b, i-1 );
     if( i+1<e ) QSort( i+1, e );
     return;
}

int Dp( void ){
    int time=1, j=1;
    t[n+1] = OO;
    f[0] = 0;
    while( time<=t[n] ){
           while( time < t[j] ){
                  f[time] = f[time-1];
                  ++time;
           }
           f[time] = f[time-1];
           
           while( time == t[j] ){
                  if( f[time] < f[s[j]] + v[j] ) f[time] = f[s[j]] + v[j];
                  ++j;
           }
           
           ++time;
    }
    return f[t[n]];
}