#!/bin/python

import sys


n = int(raw_input().strip())
X = []
Y = []
for a0 in xrange(n):
    x,y = raw_input().strip().split(' ')
    x,y = [int(x),int(y)]
    X += [x]
    Y += [y]
uniquex = list(set(X))
if len(uniquex) == 1:
    print "YES"
else:
    a = (float)(Y[X.index(uniquex[0])] - Y[X.index(uniquex[1])])/(uniquex[0] - uniquex[1])
    b = Y[X.index(uniquex[0])] - a * uniquex[0]
    flag = 0
    for i, j in zip(X,Y):
        if j != a * i + b:
            flag = 1
    print "NO" if flag == 1 else "YES"