import java.util.*;

public class Main{
	public static void main(String[] args){
		try(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();
			}
			Arrays.sort(A);
			System.out.println(A[N-1] - A[0]);
		}
	}
}