#include <bits/stdc++.h>
using namespace std;
#define n_l '\n'
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: "; cerr << to_string(__VA_ARGS__) << endl
template <typename T, size_t N> int SIZE(const T (&t)[N]){ return N; } template<typename T> int SIZE(const T &t){ return (int) t.size(); } string to_string(const string s, int x1=0, int x2=1e9){ return '"' + ((x1 < (int) s.size()) ? s.substr(x1, x2-x1+1) : "") + '"'; } string to_string(const char* s) { return to_string((string) s); } string to_string(const bool b) { return (b ? "true" : "false"); } string to_string(const char c){ return string({c}); } template<size_t N> string to_string(const bitset<N> &b, int x1=0, int x2=1e9){ string t = ""; for(int __iii__ = min(x1,SIZE(b)),  __jjj__ = min(x2, SIZE(b)-1); __iii__ <= __jjj__; ++__iii__){ t += b[__iii__] + '0'; } return '"' + t + '"'; } template <typename A, typename... C> string to_string(const A (&v), int x1=0, int x2=1e9, C... coords); int l_v_l_v_l = 0, t_a_b_s = 0; template <typename A, typename B> string to_string(const pair<A, B> &p) { l_v_l_v_l++; string res = "(" + to_string(p.first) + ", " + to_string(p.second) + ")"; l_v_l_v_l--; return res; } template <typename A, typename... C> string to_string(const A (&v), int x1, int x2, C... coords) { int rnk = rank<A>::value; string tab(t_a_b_s, ' '); string res = ""; bool first = true; if(l_v_l_v_l == 0) res += n_l; res += tab + "["; x1 = min(x1, SIZE(v)), x2 = min(x2, SIZE(v)); auto l = begin(v); advance(l, x1); auto r = l; advance(r, (x2-x1) + (x2 < SIZE(v))); for (auto e = l; e != r; e = next(e)) { if (!first) { res += ", "; } first = false; l_v_l_v_l++; if(e != l){ if(rnk > 1) { res += n_l; t_a_b_s = l_v_l_v_l; }; } else{ t_a_b_s = 0; } res += to_string(*e, coords...); l_v_l_v_l--; } res += "]"; if(l_v_l_v_l == 0) res += n_l; return res; } void dbgm(){;} template<typename Heads, typename... Tails> void dbgm(Heads H, Tails... T){ cerr << to_string(H) << " | "; dbgm(T...); } 
#define dbgm(...) cerr << "[" << #__VA_ARGS__ << "]: "; dbgm(__VA_ARGS__); cerr << endl
#define run(a, b) cerr << fixed << setprecision(6) << (double) (b - a) / (double) (CLOCKS_PER_SEC) << " s" << endl;
#define ll long long
#define INF (2147483647)
#define MOD (int)(1e9 + 7) 

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin >> n;
    vector<int> arr(n);
    for(auto &i : arr) {
        cin >> i;
    }
    vector<vector<int>> ans;
    for(int i = 0; i < n; ++i) {
        for(int j = i+1; j < n; ++j) {
            for(int k = j+1; k < n; ++k) {
                int sum = arr[i] + arr[j] + arr[k];
                if(arr[i] < sum - arr[i] and arr[j] < sum - arr[j] and arr[k] < sum - arr[k]) {
                    if(arr[i] != arr[j] and arr[j] != arr[k] and arr[i] != arr[k]) {
                        vector<int> a;
                        a.push_back(arr[i]);
                        a.push_back(arr[j]);
                        a.push_back(arr[k]);
                        sort(a.begin(), a.end());
                        ans.push_back(a);
                    }
                }
            }
        }
    }
    cout << ans.size() << '\n';
    return 0;
}

Measured memory_bytes: 13376