import java.util.Scanner;

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

	int N = scan.nextInt();
	int[] A = new int[N];

	for(int i = 0; i < N; i++){
	    A[i] = scan.nextInt();
	}

	int min = Integer.MAX_VALUE;
	int max = Integer.MIN_VALUE;

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

	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