#!/bin/python

import sys

X = []
Y = []

n = int(raw_input().strip())
for a0 in xrange(n):
    x,y = raw_input().strip().split(' ')
    x,y = [int(x),int(y)]
    X.append(x)
    Y.append(y)

result = "YES"
    
if len(X) > 2 :
    m_x = X[1]-X[0]
    if (m_x == 0) :
        for i in range(2,len(X)) :
            if X[i] != X[0] :
                result = "NO"
                break
    else :
        m_y = Y[1]-Y[0]
        m = m_y / m_x
        
        c = Y[0] - m*X[0]
        
        for i in range(1,len(X)) :
            if Y[i] != m*X[i]+c :
                result = "NO"
                break
        
print result