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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        Unit[] units = new Unit[n];
        for (int i = 0; i < n; i++) {
            units[i] = new Unit(i, sc.nextInt());
        }
        Arrays.sort(units);
        TreeSet<Unit> all = new TreeSet<>();
        for (Unit x : units) {
            all.add(x);
            Unit low = new Unit(-1, x.value - 1);
            Unit next = all.lower(low);
            if (next != null) {
                all.remove(next);
            }
        }
        System.out.println(all.size());
    }
    
    static class Unit implements Comparable<Unit> {
        int idx;
        int value;
        
        public Unit(int idx, int value) {
            this.idx = idx;
            this.value = value;
        }
        
        public int compareTo(Unit another) {
            if (value == another.value) {
                return idx - another.idx;
            } else  {
                return value - another.value;
            }
        }
        
        public int hashCode() {
            return idx;
        }
        
        public boolean equals(Object o) {
            Unit u = (Unit)o;
            return idx == u.idx && value == u.value;
        }
        
        public String toString() {
            return idx + ":" + value;
        }
    }
}
    
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 String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}