#!/bin/python

import sys

l=[]
li1=[]
li2=[]
n = int(raw_input().strip())
for a0 in xrange(n):
    x,y = raw_input().strip().split(' ')
    x,y = [int(x),int(y)]
    l.append([x,y])
    li1.append(x)
    li2.append(y)
try:
    m=((l[1][1]-l[0][1])*1.0)/(l[1][0]-l[0][0])
except:
    m=10000000000000000000000
for i in range(2,n):
    try:
        if m==10000000000000000000000:
            xx=((l[i][1]-l[i-1][1])*1.0)/(l[i][0]-l[i-1][0])
            
            break
        else:
            if m!=((l[i][1]-l[i-1][1])*1.0)/(l[i][0]-l[i-1][0]):
               
                break
    except:
        m=10000000000000000000000
        break
else:
    pass
if len(set(li1))==1 or len(set(li2))==1:
    print "YES"
else:
    print "NO"