#include <bits/stdc++.h>

//const static double	de_PI	= 3.14159265358979323846;
//const static int	de_MOD	= 1000000007;
//const static int	de_MAX	= 999999999;
//const static int	de_MIN = -999999999;

int main(void) {

	//std::ifstream in("123.txt");	std::cin.rdbuf(in.rdbuf());

	int N = 0;
	std::cin >> N;
	std::vector<int> A(N);
	for (int i = 0; i < N; i++) {
		std::cin >> A[i];
	}
	std::sort(A.begin(), A.end());

	unsigned long long ans = 0;
	for (int i = 0; i < N - 2; i++) {
		for (int j = i + 1; j < N - 1; j++) {
			if (A[i] == A[j]) { continue; }
			for (int k = j + 1; k < N; k++) {
				if (A[j] == A[k]) { continue; }
				ans++;
			}
		}
	}

	std::cout << ans << std::endl;

}