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. */
        Scanner in=new Scanner(System.in);
        int q=in.nextInt();
        int n=in.nextInt();
        int x[]=new int[10];
        int y[]=new int[10];
        int sum=0;
           for(int j=0;j<q;j++){
        for(int i=0;i<n;i++)
            {
            x[i]=in.nextInt();
            y[i]=in.nextInt();
            if(x[i]!=0 && y[i]!=0){
                sum++;
                   break;
            }
             
            
        }
        if (sum==1)
        System.out.println("NO");
        else
        System.out.println("YES");
    }
    }
}