#include <bits/stdc++.h>
#include <chrono>
#define ll long long int
#define endl '\n'
#define vn vector<ll>
#define vi vector<pair <ll,ll>>
using namespace std;
using namespace std::chrono;
const int MAX_N = 1e9 + 7;
#define pii pair<ll,ll>
const ll INF = 0x3f3f3f3f3f3f3f3f;
#define pb push_back
#define srt(vp) sort(vp.begin(), vp.end())
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
auto start = high_resolution_clock::now();
ll n;
cin>>n;
vn v(n+1);
for (int i=1;i<=n;i++)cin>>v[i];
ll ans = 0;
map <ll,ll> count;
for (int i=1;i<=n;i++)count[v[i]]++;
map <ll,ll> cnt;
for (int i=1;i<=n;i++){
ll num1=0;
ll num2=0;
for (int j=0;j<v[i];j++){
num1 += cnt[j];
num2 += count[j]-cnt[j];
}
cnt[v[i]]++;
ans += num1*num2;
}
cout<<ans<<endl;
auto stop = high_resolution_clock::now();
auto duration = duration_cast<microseconds>(stop - start);
//cout << "Time taken by function: " << duration.count() << " microseconds" << endl;
return 0;
}
