/* C program for Merge Sort */
#include<stdlib.h>
#include<stdio.h>
#include<iostream>
#include<vector>
using namespace std;
// Merges two subarrays of arr[].
// First subarray is arr[l..m]
// Second subarray is arr[m+1..r]
int toplam=0;
int merge(vector<int> arr, int l, int m, int r)
{
    int i, j, k;
    int n1 = m - l + 1;
    int n2 =  r - m;
 
    /* create temp arrays */
    int L[n1], R[n2];
 
    /* Copy data to temp arrays L[] and R[] */
    for (i = 0; i < n1; i++)
        L[i] = arr[l + i];
    for (j = 0; j < n2; j++)
        R[j] = arr[m + 1+ j];
 
    /* Merge the temp arrays back into arr[l..r]*/
    i = 0; // Initial index of first subarray
    j = 0; // Initial index of second subarray
    k = l; // Initial index of merged subarray
    while (i < n1 && j < n2)
    {
        if (L[i] <= R[j])
        {
            arr[k] = L[i];
            i++;
        }
        else
        {
            arr[k] = R[j];
            j++;
        }
        k++;
    }
 
    /* Copy the remaining elements of L[], if there
       are any */
    while (i < n1)
    {
        arr[k] = L[i];
        i++;
        k++;
    }
 
    /* Copy the remaining elements of R[], if there
       are any */
    while (j < n2)
    {
        arr[k] = R[j];
        j++;
        k++;
    }
    return i,j,k;
}
 
/* l is for left index and r is right index of the
   sub-array of arr to be sorted */
void mergeSort(vector<int> arr, int l, int r)
{
    if (l < r)
    {
        // Same as (l+r)/2, but avoids overflow for
        // large l and h
        int m = l+(r-l)/2;
 
        // Sort first and second halves
        mergeSort(arr, l, m);
        mergeSort(arr, m+1, r);
        ::toplam+=merge(arr, l, m, r);
    }
    
}
 
/* UTILITY FUNCTIONS */
/* Function to print an array */
void printArray(vector<int> A, int size)
{
    int i;
    for (i=0; i < size; i++)
        printf("%d ", A[i]);
    printf("\n");
}
 
/* Driver program to test above functions */

int main(){
    int n;
    cin >> n;
    vector<int> m(n);
    for(int m_i = 0; m_i < n; m_i++){
       cin >> m[m_i];
    }
    mergeSort(m, 0, n - 1);
    cout<<::toplam-1<<endl;
    return 0;
}