#!/bin/python3

import sys


n = int(input().strip())
X = list()
Y = list()
for a0 in range(n):
    x,y = input().strip().split(' ')
    x,y = [int(x),int(y)]
    X.append(x)
    Y.append(y)
    
success = True

for i in range(2,n):
    tmp1 = (X[0]-X[1])*(Y[i]-Y[0])
    tmp2 = (Y[0]-Y[1])*(X[i]-X[0])
    if tmp1 != tmp2:
        success = False
        break
    
if success == False:
    print("NO")
else:
    print("YES")