#!/bin/python3

import sys


n = int(input().strip())
for i in range(n):
    x,y = input().strip().split(' ')
    x,y = [int(x),int(y)]
    
    if i > 1:
        try:
            if (y - inity) / (x - initx) != slope:
                print('NO')
                break
        except:
            if slope != float('inf'):
                print('NO')
                break
        else:
            if slope*x - y != num:
                print('NO')
                break
    elif i == 0:
        initx, inity = x, y
    elif i == 1:
        try:
            slope = (y - inity) / (x - initx)
        except:
            slope = float('inf')
            num = -99999999
        else:
            num = slope*x - y
else:
    print('YES')