package main

import (
	"fmt"
)

// GR is Golden Ratio
const GR = 1.6180339887498948482045868343656

// GRSectionSearch returns z, for a minimum value of f(x) in [lb, ub], and the x.
func GRSectionSearch(lb, ub int64, f func(int64) int64, n int) (z int64, x int64) {
	var x1, x2, f1, f2 int64
	x1 = lb + int64(float64(ub-lb)/(GR+1))
	x2 = lb + int64(float64(ub-lb)/GR)
	f1, f2 = f(x1), f(x2)
	for i := 0; i < n; i++ {
		if ub-lb < 4 {
			x, z = lb, f(lb)
			for j := lb + 1; j <= ub; j++ {
				if y := f(j); y < z {
					x, z = j, y
				}
			}
			return
		}
		if f1 <= f2 {
			ub = x2
			x2, f2 = x1, f1
			x1 = lb + int64(float64(ub-lb)/(GR+1))
			f1 = f(x1)
		} else {
			lb = x1
			x1, f1 = x2, f2
			x2 = lb + int64(float64(ub-lb)/GR)
			f2 = f(x2)
		}
	}
	if f2 < f1 {
		x1, f1 = x2, f2
	}
	return f1, x1
}

const inf64 = 1 << 62

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
}

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
	}

	z, x := GRSectionSearch(1, 1<<32, f, 50)

	lb := int64(1)
	for i := 0; i < 50; i++ {
		d := x - lb
		m := lb + d/2
		if f(m) == z {
			x = m
		} else {
			lb = m + 1
		}
	}
	fmt.Println(lb)
}