import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        Cake[] cakes = new Cake[n];
        for (int i = 0; i < n; i++) {
            cakes[i] = new Cake(sc.nextInt(), sc.nextInt(), sc.nextInt());
        }
        Arrays.sort(cakes);
        TreeMap<Integer, Long> ans = new TreeMap<>();
        ans.put(Integer.MAX_VALUE, 0L);
        for (Cake x : cakes) {
            long next = ans.higherEntry(x.b).getValue() + x.value;
            if (ans.getOrDefault(x.b, 0L) >= next) {
                continue;
            }
            ans.put(x.b, next);
            Integer key = x.b;
            while ((key = ans.lowerKey(key)) != null) {
                if (ans.get(key) > next) {
                    break;
                }
                ans.remove(key);
            }
        }
        System.out.println(ans.firstEntry().getValue());
    }
    
    static class Cake implements Comparable<Cake> {
        int a;
        int b;
        int value;
        
        public Cake(int a, int b, int value) {
            this.a = a;
            this.b = b;
            this.value = value;
        }
        
        public int compareTo(Cake another) {
            if (a == another.a) {
                return b - another.b;
            } else {
                return another.a - a;
            }
        }
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}