#!/bin/python3

import sys


n = int(input().strip())
co_ord = []
for a0 in range(n):
    x,y = input().strip().split(' ')
    x,y = [int(x),int(y)]
    co_ord.append([x,y])

ans = []

for i in range(len(co_ord)-1):
    y = co_ord[i+1][1] - co_ord[i][1]
    x = co_ord[i+1][0] - co_ord[i][0]
    if x == 0:
        ans.append('None')
    else:
        ans.append(y/x)

flag = True

for i in range(len(ans)-1):
    if ans[i] != ans[i+1]:
        flag = False
        break

if flag:
    print('YES')
else: 
    print('NO')