#include<bits/stdc++.h>
using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int>A(N);
    for(int i = 0; i < N; i++) {
        cin >> A[i];
    }
    long long sum = 0;
    for(int i = 0; i < N; i++) {
        for(int j = i+1; j < N; j++) {
            if(A[i] != 1 && A[j] != 1) {
                sum++;
            }
            else if(A[i] != 2 && A[j] != 2) {
                sum+=2;
            }
            else {
                sum+=3;
            }
        }
    }
    cout << sum << endl;
}