import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		try (Scanner scan = new Scanner(System.in)) {
			int n = scan.nextInt();
			long[] y = new long[n];
			for(int i=0; i<n; i++) {
				y[i] = scan.nextLong();
			}
			Arrays.sort(y);
			long sum = 0;
			if(n % 2 == 1) {
			    sum = calcSum(y, n/2);
			} else {
			    sum = Math.min(calcSum(y, n/2) , calcSum(y, n/2-1));
			}
			System.out.println(sum);
		}
	}
	
	private static long calcSum(long[] y, int index) {
		long sum = 0;
		long base = y[index];
		for(int i=0; i<y.length; i++) {
		    sum += Math.abs(y[i] - base);
		}
		return sum;
	}
}