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();
		}
		int max=a[0],min=a[0];
		for(int i=1;i<N;i++) {
			if(a[i]>max)max=a[i];
			else if(a[i]<min)min=a[i];
		}
		System.out.print(max-min);
		sc.close();
	}

}