import java.util.Scanner

import scala.annotation.tailrec

object Problem180 {

  def ugliness(AB: Seq[(Int, Int)], tab: Long): Long = {
    val width: Seq[Long] = AB.map(x => x._1 + x._2 * tab)
    width.max - width.min
  }

  @tailrec
  def search(AB: Seq[(Int, Int)], left: Long, right: Long): Int = {
    if (left == right) return ((right + left) * 0.5).toInt

    val nextLeft: Long = (left * 2 + right) / 3
    val nextRight: Long = (left + right * 2) / 3

    if (ugliness(AB, nextLeft) <= ugliness(AB, nextRight)) {
      search(AB, left, nextRight)
    } else {
      search(AB, nextLeft + 1, right)
    }
  }

  def proc(AB: Seq[(Int, Int)]): Long = {
    search(AB, 1, Math.pow(10, 9).toLong + 1)
  }

  def main(args: Array[String]) {
    val sc = new Scanner(System.in)
    val N = sc.nextInt()
    val AB = Seq.fill(N)(sc.nextInt(), sc.nextInt())

    val result = proc(AB)
    println(result)
  }
}