import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int[] m = new int[n];
    for(int i = 0; i < n; i++) {
      m[i] = sc.nextInt();
    }
    int ans = 0;
    for(int i = 0; i < n; i++) {
      for(int j = i + 1; j < n; j++) {
        if(m[i] > m[j]) ans++;
      }
    }
    System.out.println(ans);
  }
}