import java.util.*;
import java.lang.*;
import java.math.*;
class sameline
{
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		double x1,y1,x2,y2,slope1,s2;
		int n=sc.nextInt();
		x1=sc.nextDouble();
		y1=sc.nextDouble();
		x2=sc.nextDouble();
		y2=sc.nextDouble();
		double yt=y2-y1;
		double xt=x2-x1;
		if(yt==0)
		{
			slope1=0;
		}
		if(xt==0)
		{
			slope1= -1.175608665;
		}
		else
		{
			slope1=(y2-y1)/(x2-x1);
		}
		
		boolean m=true;
		boolean fin=true;
		for(int i=0;i<n-2;i++)
		{
			x2=sc.nextDouble();
			y2=sc.nextDouble();
			yt=y2-y1;
			xt=x2-x1;
			if(yt==0)
			{
				s2=0;
			}
			if(xt==0)
			{
				s2= -1.175608665;
			}
			else
			{
				s2=(y2-y1)/(x2-x1);
			}
			if(s2!=slope1)
			{
				fin=false;
			}
		}
		if(fin)
		{
			System.out.println("YES");
		}
		else
		{
			System.out.println("NO");
		}
	}
}