import java.util.*;

public class PointOnALine {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();

		int[][] a = new int[n][2];
		for(int i = 0 ;i < n; i ++) {
			a[i][0] = in.nextInt();
			a[i][1] = in.nextInt();
		}
				
		
		boolean same_line = true;
		int x = a[0][0];
		for(int i = 1 ;i < n; i ++) {
			if( x != a[i][0])
				same_line = false;
		}
		
		if(same_line) {
			System.out.println("YES");
			System.exit(0);}
		
		same_line = true;
		int y = a[0][1];
		for(int i = 1 ;i < n; i ++) {
			if( y != a[i][1])
				same_line = false;
		}
		
		if(same_line) {
			System.out.println("YES");
			System.exit(0);
			}
		System.out.println("NO");
		in.close();
	}
}