import java.util.Scanner;


public class Main {
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int amax = 0;
		int amin = 1000;
		
		
		for(int i = 0; i < N; i++){
			int j = sc.nextInt();
			if(amax < j) amax = j;
			if(amin > j) amin = j;			
		}
		
		System.out.println(amax - amin);
		

		
		
	}

}
