import java.util.LinkedList;
import java.util.List;
import java.util.Scanner;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        List<Point> p = new LinkedList<>();
        for (int a0 = 0; a0 < n; a0++) {
            int x = in.nextInt();
            int y = in.nextInt();

            p.add(new Point(x, y));
        }


        boolean a = check(p);

        System.out.println(a ? "YES" : "NO");
    }

    static boolean check(List<Point> points) {
        long dis = points
            .stream()
            .map(Point::getX)
            .distinct()
            .count();

        if (dis < (points.size() - 2)) {
            return true;
        }

        dis = points
            .stream()
            .map(Point::getY)
            .distinct()
            .count();

        return (dis < (points.size() - 2));
    }
}

class Point {
    int x, y;

    Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    int getX() {
        return this.x;
    }

    int getY() {
        return this.y;
    }

}