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#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
template<class T> using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
int main()
{
int n;
cin>>n;
long long int arr[n];
ordered_multiset<long long int> left;
ordered_multiset<long long int> right;
for(int i =0;i<n;i++){
cin>>arr[i];
right.insert(arr[i]);
}
long long int cnt = 0;
for(int i =0;i<n;i++){
long long int l = left.order_of_key(arr[i]);
long long int r = right.order_of_key(arr[i]);
cnt+=l*r;
left.insert(arr[i]);
right.erase(right.find_by_order(right.order_of_key(arr[i])));
}
cout<<cnt;
}
