import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */

public class Main {
    public static void main(String[] args) {
        InputStream    inputStream    = System.in;
        OutputStream outputStream = System.out;
        InputReader    in                      = new InputReader(inputStream);
        PrintWriter      out                    = new PrintWriter(outputStream);
        Task                 solver               = new Task();
        solver.solve(1, in, out);
        out.close();
    }

    static class Task {
    	public void solve(int testNumber, InputReader in, PrintWriter out) {
    		int N = in.nextInt();
    		int[] A = new int[N];
    		for(int i = 0; i < N; i++) {
    			A[i] = in.nextInt();
    		}
    		int max = Math.abs(A[0]);
    		int min = Math.abs(A[0]);
    		for(int i = 1; i < N; i++) {
    			max = Math.max(max, A[i]);
    			min = Math.min(min, Math.abs(A[i]));
    		}
    		out.println(max - min);
    		
    	}
    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }

    }
}


/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