from math import floor, ceil
def func(x,tmpx,fx):
	l = [a + b*tmpx for a,b in ab]
	flx = max(l) - min(l)
	if flx < fx:
		return tmpx,flx
	else:
		return x,fx
N = int(raw_input())
ab = [map(int,raw_input().split(" ")) for i in xrange(N)]
x,fx = func(1,1,10**10)
for i in xrange(N-1):
	for j in xrange(i+1,N):
		if ab[i][1] == ab[j][1]:
			continue
		tmpx = (ab[j][0] - ab[i][0])*(-1.) / (ab[j][1] - ab[i][1])
		if tmpx < 1:
			continue
		x,fx = func(x,int(floor(tmpx)),fx)
		x,fx = func(x,int(ceil(tmpx)),fx)
print x