#!/bin/python3

import sys


xCoord = []
yCoord = []

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


if (xCoord[0] - xCoord[1]) == 0 :
    straightLine = True
    
    for i in range(2,len(xCoord)) :
        if(xCoord[i] != xCoord[0]) :
            straightLine = False
                
    if(straightLine == True) :
        print("YES")
    else :
        print("NO")
            
else :
    straightLine = True
    slope = (yCoord[1] - yCoord[0])/(xCoord[1] - yCoord[0])
    yInt = yCoord[0] - slope * xCoord[0]
    
    for i in range(2, len(xCoord)) :
        if(yCoord[i] != slope * xCoord[i] + yInt) :
            straightLine = False
            break
                
    if(straightLine == True and slope == 0) :
        print("YES")
    else :
        print("NO")