#include<bits/stdc++.h>
 
#define F first    
#define S second
#define mp make_pair
#define pii pair<int,int>         
// mikty prikoldar
#define ll long long  
#define pb push_back
#define sz(a) (int)(a.size())
#define Accepted 0
//everything goes according to the plan
#define y1 		 NOT
#define left   NEEDED
#define right  THINGS      
//countdown BEGAN. 10 , 9 , 8 ...
const int Mod = (int)1e9 + 7;
const int MX = 1073741822;
const ll MXLL = 9223372036854775807;
const int Sz = 1110111;
// ai dyn dyn dyn dirindai ai dyn dyn dirindai
using namespace std;
// skr skr skr v chernih naikah
inline void Read_rap () {	// smoke weed everyday
	ios_base :: sync_with_stdio(0);
	cin.tie(0);	cout.tie(0);
}
int n, x[Sz], y[Sz];
set <double> s;            
int main() 
{
	Read_rap (); 
	cin >> n;
	for (int i = 1;i <= n;i ++)	cin >> x[i] >> y[i];
	for (int i = 1;i <= n;i ++)
		for (int j = i+1;j <= n;j ++) {
			int v = y[j] - y[i], u = x[j] - x[i];
			if (!v && !u)	continue;
			if (u)	s.insert ((double(v / u)));
				else	s.insert (-1);
		}
	if (sz(s) == 1)	cout << "YES";
		else	cout <<"NO";	
						     
 
	return Accepted;
}	                                                           
 
 
 
 
 
 
 
 
 
// Coded by Z...