import java.util.*;

public class Java_100_nock {
    public static void main(String[] args) {
       
        Scanner sc = new Scanner(System.in);
        String line;
        int N;
        line = sc.nextLine();
        N = Integer.parseInt(line);
        int flg = 0;
        String s[];
        if((1<=N&&N<=200000)!=true)flg=1;
        if(flg!=1){
         int data[][] = new int[N][3];
         line = null;
         
         for(int i=0;i<N;i++){
             line = sc.nextLine();
             s = line.split(" ");
             data[i][0] = Integer.parseInt(s[0]);
             data[i][1] = Integer.parseInt(s[1]);
             data[i][2] = Integer.parseInt(s[2]);
         }
         
         int max_a = 0;
         int max_b = 0;
         int cnt = 1;
         int box[] = new int[N];
         int kcal = 0;
         for(int i=0;i<N;i++){
             max_a=data[i][0];
             max_b=data[i][1];
             kcal=data[i][2];
             for(int x=0;x<N;x++){
                if(i==x)continue;
                 
                if((max_a<data[x][0])&&(max_b<data[x][1])){
                    max_a=data[x][0];
                    max_b=data[x][1];
                    kcal += data[x][2];
                }
                 
                 cnt++;
                 
             }

             box[i] = kcal;

             max_a = 0;
             max_b = 0;
             kcal = 0;
             cnt = 1;

         }
         int max = 0;
         cnt = 0;
         for(int i=0;i<N;i++){
            if(max==0)max = box[i];
            if(max<box[i])max = box[i];
         }
         
         System.out.println(max);
         

        }
        
    }
    
}