Petya Vasya got employ courier during work day deliver package n different point line accord company internal rule delivery package carry strictly certain order Initially Petya point coordinate s1 Vasya point coordinate s2 client point x1x2xn order require visitthe guy agree advance deliver package customer act follow when package ith client deliver deliver package i1st client send path person go point xi the friend busy deliver current package stand stillTo communicate guy get walkietalkie the walkietalkie work poorly great distance Petya Vasya want distribute order maximum distance day low possible help Petya Vasya minimize maximum distance observe delivery rule