#include "bits/stdc++.h"
using namespace std;
using ll     = long long;
using pii    = pair<int, int>;
using pll    = pair<ll, ll>;
using vi     = vector<int>;
using vl     = vector<ll>;
using vvi    = vector<vi>;
using vvl    = vector<vl>;
const ll INF = 1LL << 60;
const ll MOD = 1000000007;
template <class T>
bool chmax(T &a, const T &b) {
    return (a < b) ? (a = b, 1) : 0;
}
template <class T>
bool chmin(T &a, const T &b) {
    return (b < a) ? (a = b, 1) : 0;
}
template <class C>
void print(const C &c, std::ostream &os = std::cout) {
    std::copy(std::begin(c), std::end(c), std::ostream_iterator<typename C::value_type>(os, " "));
    os << std::endl;
}

ll sumd(ll p) {
    p -= (p - 1) / 9 * 9;
    return p;
}

int main() {
    int n;
    cin >> n;
    vl p(n);
    ll ret = 1;
    for (int i = 0; i < n; ++i) {
        cin >> p[i];
        p[i] = sumd(p[i]);
        ret  = sumd(ret * p[i]);
    }
    cout << ret << "\n";
    return 0;
}