import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		long max = Long.MIN_VALUE;
		long min = Long.MAX_VALUE;
		for (int i=0;i<N;i++) {
			long temp = sc.nextLong();
			if (temp>max) {
				max = temp;
			}
			if (temp<min) {
				min = temp;
			}
		}
		System.out.println(max-min);
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz