#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,i;float rat;
    cin >> n;
    int x[n],y[n];
    for(i=0;i<n;i++)
        {
        cin>>x[i]>>y[i];
    }
    i=1;
    if(y[0]-y[1]==0)
       {while(y[0]-y[i]==0 && i<n)
        {
        i++;
    }
           if(i==n)
        cout<<"YES";
    else
        cout<<"NO";}
   else 
   {rat=(x[0]-x[1])/(y[0]-y[1]);
    
    i=1;
    while(1.0*(x[0]-x[i])/(y[0]-y[i])==rat && i<n)
        {
        
        i++;
    }
    if(i==n)
        cout<<"YES";
    else
        cout<<"NO";}
    
    
    return 0;
}