package main

import (
	"fmt"
)

func min(x, y int64) int64 {
	if y < x {
		return y
	}
	return x
}
func max(x, y int64) int64 {
	if y > x {
		return y
	}
	return x
}

const inf64 = 1 << 62

func main() {
	var N int
	var A, B [1010]int64
	fmt.Scan(&N)
	for i := 0; i < N; i++ {
		fmt.Scan(&A[i], &B[i])
	}

	f := func(x int64) int64 {
		var maxF, minF int64
		minF, maxF = inf64, -1
		for i := 0; i < N; i++ {
			g := A[i] + B[i]*int64(x)
			maxF = max(g, maxF)
			minF = min(g, minF)
		}
		return maxF - minF
	}

	var l, r int64
	l, r = 1, 1<<32
	for i := 0; i < 64; i++ {
		d := r - l
		d2 := d / 2
		m := l + d2
		switch {
		case f(l) > f(r):
			l = m
		case f(l) < f(r):
			r = m
		}
	}
	if f(r) < f(l) {
		l = r
	}
	fmt.Println(l)
}