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,max,x;
			min = max = a[0];
		for(int i = 0;i < n;i++) {
			if(max < a[i]) {
				max = a[i];
			}
			if(min > a[i]) {
				min = a[i];
			}
		}
		x = max - min;
		System.out.println(x);
	}
}
