import sys

import math

from typing import List, Tuple


def int1(x: str, /): return int(x) - 1


def input(): return sys.stdin.readline().rstrip('\n')


def dbg(*args, **kwargs):
    print(*(repr(arg) for arg in args), *(f'{k}: {repr(v)}' for k, v in kwargs.items()), sep='; ', file=sys.stderr)


def main():
    n = int(input())
    ab = [tuple(map(int, input().split())) for _ in range(n)]

    def calc(x):
        mx = max(a + b * x for a, b in ab)
        mn = min(a + b * x for a, b in ab)
        return mx - mn, x

    lo = 1
    hi = 10 ** 9
    while hi - lo > 2:
        mi1 = (lo + hi) // 2
        mi2 = mi1 + 1
        if calc(mi1) < calc(mi2):
            hi = mi2
        else:
            lo = mi1

    ans = lo
    for i in range(lo + 1, hi + 1):
        if calc(ans) > calc(i):
            ans = i
    return ans


def _start():
    ret = main()

    if ret is not None:
        if isinstance(ret, List) or isinstance(ret, Tuple):
            print(*ret)
        else:
            print(ret)


if __name__ == '__main__':
    _start()