import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class PointsOnaLine {

	public static void main(String[] args) {
		
		
		

		BufferedReader bufferedReader=new BufferedReader(new InputStreamReader(System.in));
		
		
		try {
			
			
			int n=Integer.parseInt(bufferedReader.readLine());
			
			ArrayList<Integer> xList=new ArrayList<>();
			ArrayList<Integer> yList=new ArrayList<>();
			
			for(int i=0;i<n;i++){
				
				
				
				
				String[] input=bufferedReader.readLine().split(" ");
				
				int x1=Integer.parseInt(input[0]);
				int y1=Integer.parseInt(input[1]);
				
				xList.add(x1);
				yList.add(y1);
				
				
				
				
			}
			
			
			
			int xPrevious=xList.get(0);
			boolean isLine=true;
			
			for(int k=1;k<xList.size();k++){
				
				if (xPrevious!=xList.get(k)) {
					isLine=false;
					break;
				}
				
			}
			
			
			
			if (isLine) {
				System.out.println("YES");
			}
			
			else {
				
				isLine=true;
				
				
				int yPre=yList.get(0);
				
				
				for(int k=1;k<yList.size();k++){
					
					if (yPre!=yList.get(k)) {
						isLine=false;
						break;
					}
					
				}
				
				if (isLine) {
					System.out.println("YES");
				}
				
				else {
					System.out.println("NO");
				}
				
				
			}
			
			
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}