#!/bin/python3

import sys
m={}
k={}
cevap=0
n = int(input().strip())
for a0 in range(n):
    x,y = input().strip().split(' ')
    x,y = [int(x),int(y)]
    m[a0]=x
    k[a0]=y
ilk=k[0]
ilkk=m[0]
for i in range(n):
    k[i]=k[i]-ilk
    m[i]=m[i]-ilkk

if m[1]!=0:
    tan=k[1]/m[1]
if  m[1]==0:
    tan=0
for i in range(1,n):
    if m[i]!=0:
        mn=k[i]/m[i]
    if  m[i]==0:
        mn=0
    if mn!=tan:
        cevap+=1
        
if cevap>0:
    print("NO")
else:
    print("YES")