import java.util.*;

public class Main{ // Main
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int[] a = new int[n];
		for(int i = 0; i < n; i ++) {
			a[i] = scanner.nextInt();
		}
		Arrays.sort(a);
		System.out.println(a[n-1] - a[0]);
		
		scanner.close();
	}
}