import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();

		long min = Long.MAX_VALUE;
		long max = Long.MIN_VALUE;

		long a = 0;

		for(int i = 0;i<N;i++){
			a = sc.nextLong();
			if(a < min){
				min = a;
			};
			if(a > max){
				max = a;
			};
		}
		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