#include <iostream>
using namespace std;
int main(){
    int n;
    cin >> n;
    int x[n],y[n];
    for(int i=0;i<n;i++){
        cin >> x[i] >> y[i];
    }
    bool infiniteSlope=false;
    float slope,temp;
    for(int i=0;i<n;i++){
        if(x[i]==x[0]){
          infiniteSlope = true;  
          break;
        }
    }
    if(infiniteSlope == false){
        cout << "Entered here";
        slope = (y[1]-y[0])/(x[1]-x[0]);
        for(int i=1;i<n;i++){
            temp = (y[i]-y[i-1])/(x[i]-x[i-1]);
            if(temp!=slope){
                cout << "NO";
                return 0;
            }
        }
        cout << "YES";
    }
    else{
        for(int i=0;i<n;i++){
            if(x[i]!=x[0]){
              cout << "NO";  
              return 0;
            }
        }
        cout << "YES";
    }
    return 0;
}