#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>
#include <ctype.h>
#include <fstream>
#include <cassert>
//#include <bits/stdc++.h>
using namespace std;

//#include<bits/stdc++.h>


	
int main() {
	int n;
	cin >> n;
	int x[105] = {};

	for (int i = 0; i < n; i++) {
		int a;
		cin >> a;
		x[a]++;
	}
	long  ans = 0;
	for (int i = 0; i <= 100; i++) {
		for (int j = i + 1; j <= 100; j++) {
			for (int k = j + 1; k <= 100; k++) {
				ans += x[i] * x[j] * x[k];
			}
		}
	}
	cout << ans << endl;

	return 0;
}