import java.util.Scanner;

class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();
		
		int[] a = new int[N];
		for(int i=0; i<N; i++){
			a[i] = sc.nextInt();
		}

		int max = a[0];
		int min = a[0];
		for(int i=1; i<N; i++){
			if(a[i]>max){
				max = a[i];
			}
			if(a[i]<min){
				min = a[i];
			}
		}

		System.out.println(max-min);

	}

}
