#include <iostream>
#include <cstdio>
#include <string.h>
#include <math.h>
#include <vector>
#include <algorithm>
using namespace std;

int main()
{
	int n; cin>>n;
	bool verticalLine=false;
	bool ansNo = false;
	int *Xarr=(int*)malloc(n*sizeof(int));
	int *Yarr=(int*)malloc(n*sizeof(int));		
	for(int i = 0; i < n; i++){
		cin>>Xarr[i]>>Yarr[i];
	}
	float slope;
	if(Xarr[0]!=Xarr[1]){
		slope = (Yarr[1]-Yarr[0])/(Xarr[1]-Xarr[0]);
	}
	else verticalLine=true;
	
	for(int i = 2; i < n; i++){
		if(!verticalLine){
			if(slope!=((Yarr[i]-Yarr[i-1])/(Xarr[i]-Xarr[i-1]))){
				printf("NO");
				ansNo = true;
				break;
			}
		}
		else{
			if(Xarr[i]!=Xarr[i-1]){
				printf("NO");
				ansNo = true;
				break;
			}
		}
	}
	if(!ansNo){
		printf("YES");
	}
	return 0;
}