#include <bits/stdc++.h>
using namespace std;
int main(){
  int n,a,b,c,d,e,f,dx,dy,p,q,fl=0;

  cin >> n;
    cin >> a >> b;
    cin >> c >> d;
    dx=c-a;
    dy=d-b;
    n=n-2;
    while(n--){
      cin >> e >> f;
      p=e-a;
      q=f-b;
      if((p*dy-q*dx)!=0)fl=1;
    }
    if(fl)cout << "NO" << endl;
    else if(dx!=0 && dy!=0)cout << "NO" << endl;
    else cout << "YES" << endl;

  }