#!/bin/python3

import sys


n = int(input().strip())
for a0 in range(n):
    x,y = input().strip().split(' ')
    x,y = [int(x),int(y)]
    if not a0:
        dif = [x,y]
    else:
        if dif[0] == 0 and x != 0 or dif[0] != 0 and x == 0 or dif[1] == 0 and y != 0 or dif[1] != 0 and y == 0:
            print("NO")
            break
        if dif[0] != 0 and dif[1] != 0:
            if x/dif[0] != y/dif[1]:
                print("NO")
                break
else:            
    print("YES")