#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    float n,x1,y1,x,y,d,d1,flag;
    cin>>n;
    cin>>x1>>y1;
    cin>>x>>y;
    d1=(y-y1)/(x-x1);
    n=n-2;
    if(n==0)
        {
        cout<<"YES\n";
    }
    else
        {
        flag=0;
    while(n--&&flag==0){
        cin>>x>>y;
        d=(y-y1)/(x-x1);
        if(d!=d1){
            flag=1;
        }
    }
        if(flag==0)
            {
            cout<<"YES\n";
        }
        else
            {
            cout<<"NO\n";
        }
    }
    return 0;
}