////TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
//// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
//void main() {
//    //TIP Press <shortcut actionId="ShowIntentionActions"/> with your caret at the highlighted text
//    // to see how IntelliJ IDEA suggests fixing it.
//    IO.println(String.format("Hello and welcome!"));
//
//    for (int i = 1; i <= 5; i++) {
//        //TIP Press <shortcut actionId="Debug"/> to start debugging your code. We have set one <icon src="AllIcons.Debugger.Db_set_breakpoint"/> breakpoint
//        // for you, but you can always add more by pressing <shortcut actionId="ToggleLineBreakpoint"/>.
//        IO.println("i = " + i);
//    }
//}


import java.util.Arrays;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();

//        int m = sc.nextInt();

        int[] arr = new int[n+1];
        Arrays.fill(arr,0);
        for (int i=1; i<2*n+1; i++){
            int input =sc.nextInt();
            if(arr[input]==0) {
                arr[input] += i;
            }
            else {
                arr[input]= Math.abs(arr[input]-i);
            }
        }
        long res =0;
        for (int i =0 ;i<n+1;i++){
            res+=arr[i];
        }
        System.out.print(res);


    }
}