#include <iostream>
#include <array>
#include <algorithm>
#include <cstdlib>
using namespace std;

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

    int N;
    cin >> N;

    array<int, 7> cnt{};
    for (int i = 0; i < N; ++i) {
        int A;
        cin >> A;
        ++cnt[A];
    }

    int answer = 0;
    for (int x = 1; x <= 3; ++x) {
        int y = 7 - x;
        if (cnt[x] + cnt[y] == 0) continue;
        answer += max(1, abs(cnt[x] - cnt[y]));
    }

    cout << answer << '\n';
    return 0;
}