#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;


int main(){
    int n;
    cin >> n;
    double x1,x2,y1,y2;
    cin>>x1;
    cin>>y1;
    cin>>x2;
    cin>>y2;
    double m=0,t=0;
    if((x2-x1)!=0)
     m = (y2-y1)/(x2-x1);
   // cout<<m<<"\n";
    for(int a0 =2; a0 < n; a0++) 
    {
       double x;
        double y;
        cin>>x;
        cin>>y;
         //cout<<((y2-y)/(x2-x))<<"  "<<m<<"\n";
        if((x2-x)==0 && m!=0)
            {}
       else if((x2-x)==0 && m==0)
           {}
       else if(((y2-y)/(x2-x))!=m)
           {
          // cout<<"break\n";
            t=1;
           break;
       }
    }
    if(t==0)
        cout<<"YES";
    else
        cout<<"NO";
}