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

public class Solution {
 static int count=0,n1;
    
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
         int n = in.nextInt();
      n1=n;
        for(int a0 = 0; a0 < n; a0++){
            int x = in.nextInt();
            int y = in.nextInt();
            if((x==0 && y >= 0) ||(y==0 && x>=0))
            {  count++;}
            else if(x<=0 && y==0)
            {   count++;}
            else if(y<=0 && x==0)
                {count++;}
        }
        if(count == n)
        System.out.println("YES");
          else
        System.out.println("NO");
    }
}