#include <iostream>
#include <stdio.h>
#include <string>
#include <algorithm>
#include <vector>
#include <set>

//----- INPUT-------//		
#define si(a) 		scanf("%d", &a)                        //scan 	integer
#define sii(a, b)	scanf("%d%d", &a, &b)		//scan  	two ingerts
#define sl(a) 		scanf("%lld", &a)			//scan  	long long integer
#define sll(a, b) 	scanf("%lld %lld", &a, &b)	//scan  	two long long integer
#define ss(a) 		scanf("%s", a)				//scan   	string
#define ci(a)		cin>>a					//c++	input

//------OUTPUT------//
#define pi(a) 		printf("%d", a)				//print	integer	with new line
#define pii(a,b) 	printf("%d %d", a, b)		//print 	two integers
#define pl(a) 		printf("%lld", a)			//print	long long integer
#define pll(a,b) 	printf("%lld %lld", a, b)		//print	two long long integer
#define ps(a) 		printf("%s", a)				//print	string
#define nl			printf("\n")				//new 	line
#define co(a)		cout<<a					//c++	output
#define p_s		printf(" ")					//space

//------LOOPS-------//
#define rep(i, a, b)	for(i=a; i<=b; i++)
#define repr(i, a, b)	for(i=a; i>=b; i--)


#define ll 			long long
#define MAX(a,b) 	(a>b) ? (a) : (b)
#define MIN(a,b) 	(a<b) ? (a) : (b)
#define pb 		push_back				//vector
#define f1 		first						//pair->first		map->first
#define s2 		second					//pair->second		map->second
#define m_p 		make_pair

using namespace std;


//----------------------------------------------CODE-------------------------------------//

int main()
{
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	int n, i;
	int x[15], y[15];
	si(n);
	rep(i, 1, n)
		sii(x[i], y[i]);
	
	int num=y[2]-y[1];
	int den=x[2]-x[1];
	//cout<<num<<" "<<den<<endl;
	int flag=0;
	rep(i, 1, n)
	{
		if((den*(y[i]-y[1]))!=(num*(x[i]-x[1])))
		{
			flag=1;
			break;
		}
	}
	
	if(flag)
		printf("NO");
	else 
		printf("YES");nl;
	
}