import java.util.*;
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		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 min = a[0];
		int max = a[0];
		for(int i = 1;i<n;i++) {
			if(min > a[i]) {
				min = a[i];
			}
			if(max < a[i]) {
				max = a[i];
			}
		}
		System.out.println(max-min);
	}

}
