import java.util.Scanner;

public class Main {

	public static void main(String args[]) {

		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();

		int max = 0;
		int min = Integer.MAX_VALUE;
		for(int i=0;i<N;i++) {
			int A = (int)Math.abs(sc.nextInt());
			if(max < A) max = A;
			if(min > A) min = A;
		}
		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