#! /usr/bin/python3

from sys import stderr

def read(f): return f(input())
def readlist(f): return [f(x) for x in input().split()]

n = read(int)
x0, y0 = readlist(int)
x1, y1 = readlist(int)
nx = y1 - y0
ny = x0 - x1
nc = nx * x0 + ny * y0
line = (nx == 0 or ny == 0)

for _ in range(2, n):
    if not line:
        break
    x, y = readlist(int)
    if nx * x + ny * y != nc:
        line = False
        break

print("YES" if line else "NO")