import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Vector;

public class Main {
public static int total;
     public static void main(String[] args) throws IOException {
        BufferedReader leitor = new BufferedReader(new InputStreamReader(System.in));

        int a = Integer.parseInt(leitor.readLine());
        int[] vet = new int[a];
        int b = 0;
        int c = 0;
        for(int q=0;q<a;q++){
            b = Integer.parseInt(leitor.readLine());
            vet[c] = b;
            c++;
        }
        Main.total =0;
        for(int i =0;i<vet.length;i++){
            for(int j = i+1;j<vet.length;j++){
                if(vet[i]>vet[j]){
                    Main.total++;
                }
            }
        }
        System.out.println(Main.total);
    }

}