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//             Author: Udit "luctivud" Gupta @ (https://www.linkedin.com/in/udit-gupta-1b7863135/)                  //


#include <bits/stdc++.h>
#pragma GCC optimize "trapv"

using namespace std;

typedef long long int lld;
typedef unsigned long long int llu;

#define         TESTCASES()    cin >> (T3X0); T353 = T3X0; while(T3X0--)
#define         _input(V3C)    for(auto &V3C_I7 : (V3C)) cin >> (V3C_I7)
#define   mems(A77AY, V4LU)    memset((A77AY), (V4LU), sizeof((A77AY)))
#define    CH3K(I7, E4, S7)    (((S7)<0) ? (I7)>(E4) : (I7)<(E4))
#define   for4(I7,S4,E4,S7)    for(auto I7=(S4); CH3K(I7,E4,S7); (I7)+=(S7))
#define              all(x)    (x).begin(), (x).end()
#define              deb(x)    cout << #x << "=" << (x) << "\n";



void solveEachTest(lld T35TC453N = 1) {

	lld n; cin >> n;
	vector<lld> arr(n);
	_input(arr);
	lld ans = 0ll;
	for4(i, 0, n, 1) {
		for4(j, i + 1, n, 1) {
			for4(k, j + 1, n, 1) {
				if (arr[i] != arr[j] and arr[j] != arr[k] and arr[k] != arr[i]) {
					vector<lld> temp = {arr[i], arr[j], arr[k]};
					sort(temp.begin(), temp.end());
					if (temp[0] + temp[1] > temp[2]) ans++;
				}
			}
		}
	}

	cout << ans;
	cout << "\n";

	return;
}


signed main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.precision(10);

	lld T3X0 = 0, T353 = 1;

	// TESTCASES()
	solveEachTest(T353 - T3X0);
	return 0;
}
// Random Thought :  null

Measured memory_bytes: 3652