import java.util.*;

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