import java.util.Scanner;
class Main{
    public static void main(String arg[]){
        Scanner scn=new Scanner(System.in);
        int n=scn.nextInt();
        int max=0;
        int min=0;
        for(int i=0;i<n;i++){
            int buf=scn.nextInt();
            if(i==0){
                max=min=buf;
            }else{
                max=Math.max(buf,max);
                min=Math.min(buf,min);
            }
        }
        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