import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
      
int p,q,n,flag=0;
        Scanner sc=new Scanner(System.in);
       q=sc.nextInt();
        n=sc.nextInt();
        if(q>=1 && q<=10 && n>=1 && n<=10)
            {
            while(q>0)
                {
            for(int i=0;i<n;i++)
                {
               String input = sc.nextLine();    // get the entire line after the prompt 
String[] str = input.split(" ");
                int[] numbers = new int[str.length];
 for ( int j= 0; j< str.length; j++ )
        {
            numbers[j] = Integer.parseInt(str[j]);
     if(numbers[j]==0|| numbers[j+1]==0 ||(numbers[j]==0 && numbers[j+1]==0))
         flag=1;
     else
         flag=0;
            }
            }     
        }q--;
            
    }
        if(flag==1)
                System.out.print("YES");
            else
                System.out.print("NO");
    }}