This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// bayemirov
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>
using namespace __gnu_pbds;
using namespace std;
typedef long long ll;
typedef tree<
ll,
null_type,
less_equal<ll>,
rb_tree_tag,
tree_order_statistics_node_update>
ordered_set;
const int N = 4e5;
int n;
ll h[N], ans;
ordered_set a, b;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n;
for (int i = 0; i < n; i++) {
cin >> h[i];
if (i > 1)
b.insert(h[i]);
}
a.insert(h[0]);
for (int i = 1; i < n; i++) {
int cnt_x = a.order_of_key(h[i]);
int cnt_z = b.order_of_key(h[i]);
//cout << i << ' ' << cnt_x << ' ' << cnt_z << "\n";
ans += cnt_x*1ll*cnt_z;
a.insert(h[i]);
b.erase(b.find_by_order(h[i+1]));
}
cout << ans;
return 0;
}
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