import java.util.ArrayList;
import java.util.Scanner;

public class Main {

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		
		ArrayList<Integer> a = new ArrayList<>();
		
		for(int i = 0; i < n; i++) {
			a.add(sc.nextInt());
		}
		
		a.sort(null);
		
		System.out.println(a.get(n - 1) - a.get(0));
		
		
	}
}
/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