import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int n = Integer.parseInt(br.readLine());
		String[] sa = br.readLine().split(" ");
		int[] c = new int[n];
		for (int i = 0; i < n; i++) {
			c[i] = Integer.parseInt(sa[i]);
		}
		br.close();

		Arrays.sort(c);
		long ans1 = calc(c);
		reverse(c);
		long ans2 = calc(c);
		System.out.println(Math.max(ans1, ans2));
	}

	static long calc(int[] c) {
		int n = c.length;
		long suma = 0;
		long sumb = 0;
		for (int i = 0; i < n; i++) {
			if (i % 2 == 0) {
				suma += c[i];
			} else {
				sumb += c[i];
			}
		}
		long val1 = Math.abs(suma) - Math.abs(sumb);

		int n2 = (n + 1) / 2;
		suma = 0;
		sumb = 0;
		for (int i = 0; i < n2; i++) {
			suma += c[i];
		}
		for (int i = n2; i < n; i++) {
			sumb += c[i];
		}
		long val2 = Math.abs(suma) - Math.abs(sumb);
		return Math.min(val1, val2);
	}

	static void reverse(int[] a) {
		for (int i = 0; i < a.length / 2; i++) {
			int tmp = a[i];
			a[i] = a[a.length - 1 - i];
			a[a.length - 1 - i] = tmp;
		}
	}
}