import java.util.Scanner;
 
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int min =1000;
        int max =0;
        for(int i=0; i<N; i++){
            int a = sc.nextInt();
            if(min > a){
                min = a;
            }
            if(max < a){
                max = a;
            }
        }
        
        System.out.println(max - min);
    }
}