#include<bits/stdc++.h>
#define boost ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
int main()
{
    boost;
	int n;
	int x,y,p1,p2,i,j,p3,p4;
	bool flag=0;
	cin>>n;
    int xc[n];
	int yc[n];
	
	for(i=0;i<n;i++)
	{
		cin>>xc[i]>>yc[i];
	}
	if(n==2)
	{
         p3=(yc[1]-yc[0]);
	     p4=(xc[1]-yc[0]);
        if(p3==0||p4==0)
	    cout<<"YES";
        else
            cout<<"NO";
    }
	else
{
	
	
	
	//x=((xc[0]*yc[1]-xc[1]*yc[0])+y*(xc[1]-xc[0]))/(yc[1]-yc[0]);
	
	for(j=2;j<n;j++)
	{
		x=xc[j];
		y=yc[j];
		
		p1=x*(yc[1]-yc[0]) -  y*(xc[1]-xc[0]);
		
		p2=(xc[0]*yc[1]) - (xc[1]*yc[0]);
		
		if(p1!=p2)
		{
			flag=1;
			break;
		}
	}
	
        
	if(flag==0)
	cout<<"YES";
	else
	cout<<"NO";
}
	return 0;
}