#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define pb push_back
#define int long long
const int MOD = 1e9 + 7;
const int INF = 1e15;
const int N = 1e6;
int n, m, k, a, b, c, d, h, l, r, q, u, v, x, y;
vector<int> arr(N);
void solve() {
cin >> n;
for(int i = 0; i<n; i++) {
cin >> arr[i];
}
ordered_set all;
all.insert(arr[0]);
vector<int> smaller(n);
vector<int> bigger(n);
for(int i = 1; i<n; i++) {
smaller[i] = all.order_of_key(arr[i]);
all.insert(arr[i]);
}
all.clear();
all.insert(arr[n-1]);
for(int i = n-2; i>=0; i--) {
bigger[i] = all.order_of_key(arr[i]);
all.insert(arr[i]);
}
c = 0;
for(int i = 1; i<n-1; i++) c += smaller[i]*bigger[i];
cout << c;
}
int32_t main() {
ios::sync_with_stdio(false);
cout.tie(0); cin.tie(0);
int tc = 1;
// cin >> tc;
while(tc--) {
solve();
cout << "\n";
}
return 0;
}
