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 min = a[0], 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);
	}

}