#!/bin/python3

import sys

def main():
    n = int(input().strip())
    if n == 2:
        print("YES")
        return
    pnts = []
    for a0 in range(n):
        x,y = input().strip().split(' ')
        x,y = [int(x),int(y)]
        pnts.append([x,y])
    [x1,y1] = pnts[0]
    [x2,y2] = pnts[1]
    horz = False
    vert = False
    b = 0
    if x2-x1 == 0:
        vert = True
        m = x1
    elif y2-y1 == 0:
        horz = True
        m = y1
    else:
        m = (y2-y1)/(x2-x1)
        b = y1 - m*x1
    found = True
    for p in pnts[2:]:
        if horz or vert:
            if horz and m != p[1]:
                found = False
            elif vert and m != p[0]:
                found = False
        else:
            if p[1] != (m*p[0]+b):
                found = False
    if found:
        print("YES")
    else:
        print("NO")
    
    
        
main()