#include<bits/stdc++.h>
using namespace std;
float Mind=100000000;
int main(){
	int n;
	cin >> n;
	float x[n+1],y[n+1];
	int i;
	for(i=0;i<n;i++){
		cin >>x[i];
		cin >>y[i];
	}
	vector<float>m;
	for(i=1;i<n;i++){
		if(x[i]-x[0]==0)
			m.push_back(Mind);
		else
			m.push_back((y[i]-y[0])/(x[i]-x[0]));
	}
	int flag=1;
	for(i=0;i<m.size();i++){
		if(m[i]!=m[0])
			flag=0;
	}
	if(flag==1 && (m[0]==0 || m[0]==Mind))
		cout << "YES" << endl;
	else
		cout << "NO" << endl;
	return 0;
}