#pragma GCC optimize ("O2")
#pragma GCC target ("avx2")
#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;

using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please



int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	ll A[3] = {};
	int N;
	cin >> N;

	rep(i, N) {
		int a;
		cin >> a;
		if (a == 1) A[0]++;
		else if (a == 2) A[1]++;
		else A[2]++;
	}

	ll kotae = 0;
	kotae += A[0] * (A[0] - 1);
	kotae += A[1] * (A[1] - 1) / 2;
	kotae += A[2] * (A[2] - 1) / 2;
	kotae += A[0] * A[1] * 3;
	kotae += A[0] * A[2] * 2;
	kotae += A[1] * A[2] * 1;

	co(kotae);


	Would you please return 0;
}