import java.util.Scanner;

class Main{
  public static void main (String[] args){
  
    Scanner scanner=new Scanner(System.in);
    int n=scanner.nextInt();
    
    int max=0;
    int min=0;

    for(int i=0;i<n;i++){
      int a =scanner.nextInt();
     if(i==0){
      max=a;
      min=a;
    }
    if(a>max){
      max=a;
    }
    if(a<min){
      min=a;
    }
  }
    System.out.println(max-min);
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz