import java.util.Scanner;

public class Main {
	public static void main (String[] args) {
//------------------------------------------------------------

		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] array = new int[N];
		for (int i=0 ; i < N ; i++) {
			array[i] = sc.nextInt();
		}
		int max = array[0];
		int min = array[0];
		for (int i = 0 ; i<N ; i++) {
			if (array[i]>max) {
				max=array[i];
			}
			if(array[i]<min) {
				min = array[i];
			}
		}
		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