from operator import itemgetter
import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N = int(input())
AB = tuple(tuple(map(int, input().split())) for _ in range(N))


def F(x):
    up = max(a+b*x for a, b in AB)
    dn = min(a+b*x for a, b in AB)
    return up - dn


l = 0
r = 10 ** 18
while r - l > 2:
    ml = (2 * l + r) // 3
    mr = (l + r * 2) // 3
    if ml >= mr:
        break
    if F(ml) <= F(mr):
        r = mr
    else:
        l = ml

print(l+1)