import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] a = new int[n];
        long min = 1000000000;
        long max = 0;
        for(int i=0; i<n; i++) {
            a[i] = sc.nextInt();
            if(Math.abs(a[i])>max) max = Math.abs(a[i]);
            if(Math.abs(a[i])<min) min = Math.abs(a[i]);
        }
        sc.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