import java.io.IOException;
import java.io.InputStream;
import java.util.*;

public class Main {
	
    public static void main(String[] args) {
    	FastScanner sc = new FastScanner();
 
    	int n = sc.nextInt();
    	int[] seq = new int[n];
    	
    	for(int i=0;i<n;i++){
    		seq[i] = sc.nextInt();
    	}
    	
    	System.out.println(lengthOfLIS(seq));
 
    }
    
	static int lengthOfLIS(int[] seq) {
	    int[] dp = new int[seq.length];
	    int len = 0; //長さ
	 
	    for(int num: seq){
	        int idx = Arrays.binarySearch(dp, 0, len, num); //dpテーブルは単調増加なので二分探索できる
	 
	        //keyがなければ(-(挿入ポイント) - 1)が返されているので
	        if(idx < 0){
	            idx = - (idx + 1);
	        }
	 
	        dp[idx] = num;
	 
	        //長さが増えるなら更新
	        if(idx==len){
	            len++;
	        }
	    }
	 
	    return len;
	}
}


class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}
