import java.util.*;

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 ans = a[N-1]-a[0];
        System.out.println(ans);
    }
}
 