#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
const ll mod7 = 1000000007;
#define eb(x) emplace_back(x)
#define ef(x) emplace_front(x)
#define pb(x) push_back(x)
#define pf(x) push_front(x)
#define ob(x) pop_back(x)
#define of(x) pop_front(x)
#define mp(a, b) make_pair(a, b)
#define power(x, p) round(pow(x, (double)p))
#define all(x) x.begin(), x.end()
#define sortAs(x) sort(all(x));
#define sortDes(x) sort(all(x), std::greater<ll>());
#define fori(x) for (ll i = 0; i < x; i++)
#define forj(x) for (ll j = 0; j < x; j++)
#define fork(x) for (ll k = 0; k < x; k++)
#define ret(i, begin, end) for (__typeof(end) i = (begin) - ((begin) > (end)); i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))
#define rep(u, s, x) for (ll u = s; u <= x; u++)
#define rem(u, x, s) for (ll u = s; u >= x; u--)
#define RET(t) cout << t << endl; return 0;
#define RETIF(i, t) if (i) { cout << t << endl; return 0; }
#define BREAKIF(i, t) if (i) { cout << t << endl; break; }
#define CONTIF(i, t) if (i) { cout << t << endl; continue; }
#define NEWLINE cout << endl;
#define DBG(args...) { vector<string> _v = split(#args, ','); err(_v.begin(), args); cout << endl; }
vector<string> split(const string& s, char c) {
vector<string> v;
stringstream ss(s);
string x;
while (getline(ss, x, c))
v.emplace_back(x);
return move(v);
}
void err(vector<string>::iterator it) {}
template<typename T, typename... Args>
void err(vector<string>::iterator it, T a, Args... args) {
cout << it -> substr((*it)[0] == ' ', it -> length()) << ": " << a << " ";
err(++it, args...);
}
#define DBGARRAY(x, s) cout << #x << ": "; for (int z = 0; z < s; z++) cout << x[z] << " "; cout << endl;
#define DBGVECTOR(x) cout << #x << ": "; for (ll z = 0; z < x.size(); z++) cout << x[z] << " "; cout << endl;
#define DBGVECTORPAR(x, p) cout << #x << ": "; for (ll z = 0; z < x.size(); z++) cout << x[z].p << " "; cout << endl;
#define DBGMAP(x) cout << #x << ":" << endl; for (auto z = x.begin(); z != x.end(); z++) { cout << z->first << ": " << z->second << endl; }
#define DBGSET(x) cout << #x << ":" << endl; for (auto z = x.begin(); z != x.end(); z++) { cout << *z << endl;}
bool isPrime(long long a) { if (a <= 1) return 0; for(long long i = 2; i * i <= a; i++) { if(a % i == 0) return 0; } return 1; }
ll lcm(ll a, ll b) { return __gcd(a, b) ? (a / __gcd(a, b) * b) : 0; }
template<typename T>
ll biggest(T x) {ll b_i = 0; fori(x.size()) {if (x[b_i] < x[i]) {b_i = i;} } return b_i;}
template<typename T>
ll smallest(T x) {ll s_i = 0; fori(x.size()) {if (x[s_i] > x[i]) {s_i = i;} } return s_i;}
template<typename T>
string tostring(T num) { stringstream convert; convert << num; return convert.str(); }
template<typename T>
ll tonumber(T stringNum) { ll a; stringstream convert; convert << stringNum; convert >> a; return a; }
ll A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z;
char C1, C2, C3, C4;
string S1, S2, S3, S4;
vl V1, V2, V3, V4;
bool B1, B2;
int arr[123456];
int main()
{
std::ios_base::sync_with_stdio(0); cin.tie(0); cin.clear();
cin >> N;
fori(N)
{
cin >> arr[i];
}
int witchesKill[3];
rep(i, 1, N)
{
witchesKill[0] = arr[i - 1];
rep(j, i + 1, N)
{
if (j != witchesKill[0] && arr[j - 1] != i)
{
witchesKill[1] = arr[j - 1];
rep(k, j + 1, N)
{
if (k != witchesKill[0] && k != witchesKill[1] && arr[k - 1] != i && arr[k - 1] != j)
{
S++;
}
}
}
}
}
cout << S << endl;
}
