#include <iostream>
#include <vector>
#include <utility>
#include <map>
#include <algorithm>
#include <queue>
#include <cmath>

using namespace std;

int main() {
    int n;
    cin >> n;
    long long ans = 1;
    for (int i=0; i<n; i++) {
        long long p;
        cin >> p; p%=9;
        if (p == 0) p = 9;
        ans *= p; ans%=9;
        if (ans == 0) ans = 9;
    }

    cout << ans << endl;
}