#include <bits/stdc++.h>
#include <stdio.h>
using namespace std;

#define pb push_back
//#define mp make_pair
#define f first
#define s second
#define pii pair<int,int>
#define piii pair<int,pii>
#define pll pair<ll,ll>
#define psi pair<string,int>
#define rep(i,n) for(i=0;i<n;i++)
#define repd(i,n) for(i=n;i>=0;i--)
#define vi vector<int>
#define vvi vector<vector<int> >
#define vvlli vector<vector<long long int> >
#define ll long long int
#define PI 3.14159265
#define mod 1000000007

int gcd(int a,int b)
{
	if(b==0)
		return a;
	return gcd(b,a%b);
}

ll power(ll a,ll n)
{
	if(n==0)
		return 1;
	ll x=power(a,n/2);
	x=(x*x)%mod;
	if(n%2!=0)
	{
		x=x*a;
		x=x%mod;
	}
	return x;
}

bool check(ll r,ll c,ll m,ll k)
{
	if(m%c==0 || m%r==0)
		return 1;
	return 0;
}


int main() {
	double i,j,t,m,p,r,c,l,mid,a,d,n;
	cin>>n;
	vector< pair<double,double> > v(n);
	rep(i,n)
		cin>>v[i].f>>v[i].second;

	if(n<=2)
	{
		cout<<"YES"<<endl;
		return 0;
	}

	double x1,x2,y1,y2;
	x1=v[0].f;
	y1=v[0].s;
	x2=v[1].f;
	y2=v[1].s;

	if(x1==x2)
	{
		for(i=2;i<n;i++)
		{
			if(v[i].f!=x1)
			{
				cout<<"NO"<<endl;
				return 0;
			}
		}
		cout<<"YES"<<endl;
		return 0;
	}
	m=(y2-y1)/(x2-x1);
	for(i=2;i<n;i++)
	{
		if(v[i].s!=m*v[i].f+y1-m*x1)
		{
			cout<<"NO"<<endl;
			return 0;
		}
	}
	cout<<"YES"<<endl;
	return 0;
}