import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        long even = 0;
        long odd = 0;
        long[] sum = new long[n];
        int[] arr = new int[n];
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }
        Arrays.sort(arr);
        for (int i = 0; i < n; i++) {
            int x = arr[i];
            if (i % 2 == 0) {
                even += x;
            } else {
                odd += x;
            }
            if (i > 0) {
                sum[i] = sum[i - 1] + x;
            } else {
                sum[i] = x;
            }
        }
        long ans = Long.MIN_VALUE;
        ans = Math.max(ans, Math.abs(even) - Math.abs(odd));
        if (n % 2 == 0) {
            ans = Math.max(ans, Math.abs(odd) - Math.abs(even));
        }
        int idx = (n - 1) / 2;
        ans = Math.max(ans, Math.abs(sum[idx]) - Math.abs(sum[n - 1] - sum[idx]));
        idx = n / 2 - 1;
        ans = Math.max(ans, Math.abs(sum[n - 1] - sum[idx]) - Math.abs(sum[idx]));
        System.out.println(ans);
    }

    static int getRate(int p, int r) {
        return p / 100 * (100 - r);
    }
    
    static int getMinus(int p, int m) {
        return Math.max(0, p - m);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public String nextLine() throws Exception {
        return br.readLine();
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}