import java.util.Scanner;
public class Main{
	public static void main(String[] args){
		int count = 0, index = 0, temp = 0;
		int[] list;
		try(Scanner scanner = new Scanner(System.in)){
			list = new int[scanner.nextInt()];
			for(int i = 0; i < list.length; i++){
				list[i] = scanner.nextInt();
			}
		}
		for(int i = 1; i <= list.length; i++){
			for(int j = 0; j < list.length; j++){
				if(list[j] == i){
					index = j;
				}
			}
			while(index != i - 1){
				temp = list[index - 1];
				list[index - 1] = i;
				list[index] = temp;
				count++;
				index--;
			}
		}
		System.out.print(count);
	}
}