import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] nums = new int[N];
		for(int a = 0 ; a < N ; a++){
			nums[a] = sc.nextInt();
		}
		sc.close();
		int ans = 0;
		Arrays.sort(nums);
		ans = Math.abs(nums[nums.length-1])-Math.abs(nums[0]);
		System.out.println(ans);
	}
}
/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