#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,x,y,m,flag=0,m1;
	cin>>n;
	int i;
	int a[n+1],b[n+1];
	for(i=0;i<n;i++){
		cin>>a[i]>>b[i];
	}
	x = abs(a[1]-a[0]);
	y = abs(b[1]-b[0]);
	if(x==0 || y==0){
		m = 0;
	}
	else{
		m = y/x;
	}
	for(i=2;i<n;i++){
		x = abs(a[i-1]-a[i]);
		y = abs(b[i-1]-b[i]);
		if(x==0 || y==0){
			m1 = 0;
		}
		else{
			m1 = y/x;
		}
		if(m1!=m){
			flag=1;
		}
	}
	if(flag == 0){
		cout<<"YES"<<endl;
	}
	else{
		cout<<"NO"<<endl;
	}
	return 0;
}