import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = sc.nextInt();
    	ArrayList<Integer> list = new ArrayList<>();
    	list.add(0);
    	list.add(Integer.MAX_VALUE);
    	long total = 0;
    	for (int i = 0; i < n; i++) {
    	    int x = sc.nextInt();
    	    int left = 0;
    	    int right = list.size();
    	    while (right - left > 1) {
    	        int m = (left + right) / 2;
    	        if (list.get(m) < x) {
    	            left = m;
    	        } else {
    	            right = m;
    	        }
    	    }
    	    list.add(right, x);
    	    total += list.size() - right - 2;
    	}
    	System.out.println(total);
    }
}