#include<bits/stdc++.h>
#include<atcoder/all>

#define fi first
#define se second
#define eb emplace_back

using namespace std;
using namespace atcoder;
using ll = long long;

int main() {
    int N; cin >> N;
    vector<ll> A(N);
    for (int i = 0; i < N; ++i) cin >> A[i];

    if (N == 1) cout << A[0] << endl;
    else if (N == 2) cout << A[0] * A[1] << endl;
    else cout << 1 << endl;
    return 0;
}