#include<bits/stdc++.h>
#define fl(i,a,b,c) for(int i=a,i<b;i=i+c)
#define end "\n"
using namespace std;


int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    int x1,y1,x2,y2;
    cin>>x1>>y1>>x2>>y2;
    int xDiff = x2-x1, yDiff = y2-y1;
    for(int a0 = 2; a0 < n; a0++){
        int x;
        int y;
        cin >> x >> y;
        if (xDiff == 0){
            if (x != x1){
                cout<<"NO";
                return 0;
            }
        }else{
            if (y != y1){
                cout<<"NO";
                return 0;
            }
        }
    }
    if ((xDiff != 0) && (yDiff != 0)){
        cout<<"NO";
        return 0;
    }
    cout<<"YES";
    return 0;
}