import java.util.Scanner;

public class Main {
	public static void main(String args[]) {
		Scanner scn = new Scanner(System.in);
		int N = scn.nextInt();
		long min = 5000000000l,max = 0,buf;
		for(int i = 0;i < N;i++) {
			buf = Math.abs(scn.nextLong());
			if(buf < min) {
				min = buf;
			}
			if(buf > max) {
				max = buf;
			}
		}
		scn.close();
		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