//
//  PointsOnALine.cpp
//  
//
//  Created by Farbod Yadegarian on 2016-06-20.
//
//

#include <stdio.h>
#include<iostream>
using namespace std;
int x[100] , y[100];
int main()
{
    int n;
    cin >> n;
    bool b = true;
    bool b2 = true;
    for(int i = 0;i < n;i ++)
        cin >> x[i] >> y[i];
    
    for(int i = 0;i < n;i ++)
        for(int j = 0;j < n;j ++)
        {
            if(x[i] != x[j])
                b = false;
            if(y[i] != y[j])
                b2 = false;
        }
    if(b || b2)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;
    return 0;
}