fun main(args: Array<String>) {                                                                                                                                                                             
  val n = readLine()!!.toInt()                                                                                                                                                                              
  readLine()                                                                                                                                                                                                
  val eval = (1..n).map {                                                                                                                                                                                   
    readLine()!!.toInt()                                                                                                                                                                                    
  }.toList()                                                                                                                                                                                                
  println(eval.max()!! - eval.min()!!)                                                                                                                                                                      
}