import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int[] a=new int[N];
        for(int i=0; i<N; i++){
            a[i]=sc.nextInt();
        }
        Arrays.sort(a);
        int res=a[N-1]-a[0];

        
        System.out.println(res);
                
            
        
        
        
        
        
        }
    }