#!/bin/python

import sys


n = int(raw_input().strip())
a=[[0 for i in range(2)]for j in range (n)]
k=0
for a0 in xrange(n):
    x,y = raw_input().strip().split(' ')
    x,y = [int(x),int(y)]
    a[k][0]=x
    a[k][1]=y
    k+=1
if (a[0][0]==a[1][0]):
    t=a[1][0]
    m=0
    for u in range(2,n):
        if a[u][0]!=t:
            print 'NO'
            m=1
            break
    if m==0:
        print "YES"
else:
    sl=float(a[1][1]-a[0][1])/(a[1][0]-a[0][0])
    co=float((a[0][1]*a[1][0])-(a[1][1]*a[0][0]))/(a[1][0]-a[0][0])
    m=0
    for u in range(2,n):
        if(a[u][1]!=((sl*a[u][0])+co)):
            m=1
            print 'NO'
            break
    if m==0:
        print 'YES'