#include <iostream>
#include <vector>


using namespace std;

int main()
{
    vector <int> x,y;
    int n,c,h1,h2,h3,h4,s,s0,j;
    int d=0;
    cin >> n;
    for(c = 0; c < n; c++){
        cin >> h1 >> h2;
        x.push_back(h1);
        y.push_back(h2);
    }
    for(c = 0; c < n-1; c++){
            j=c+1;
            if(c==0){
               h1=x[c];
               h2=x[j];
               h3=y[c];
               h4=y[j];
               if (h2!=h1){
                    s=(h3-h4)/(h2-h1);
               }
               else{
                    s=(h2-h1)/(h3-h4);
               }
               s0=s;
            }
            else {
                h1=x[c];
                h2=x[j];
                h3=y[c];
                h4=y[j];
                if (h2!=h1){
                     s=(h3-h4)/(h2-h1);}
                else{
                     s=(h2-h1)/(h3-h4);
                };
                if (s0!=s){
                    cout << "NO";
                    d=1;
                    break;
                }
                s0=s;
            }
    }
    if (d==0){
        cout<<"YES";
    }

    return 0;
}