#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>

using namespace std;

#define int __int128
#define endl "\n"

const long long INF = (long long)1e18;
const int MOD = 1'000'000'007; 

string yn(bool f){return f?"Yes":"No";}
string YN(bool f){return f?"YES":"NO";}

long long power(long long x, long long n){
	long long ans = 1;
	int N = n;
	
	if(x == 0) return 1;
	if(x >= 4) return -1;
	
	n = 1;
	
	for(int i = 1; i <= N; i++){
		n *= i;
	}
	// cout<<"n = "<<n<<endl;
		
	for(;n;n >>= 1, x *= x) {
		if(n&1)ans*=x;
		if(ans > MOD) return -1;
	}
	
	return ans;
}


signed main(){
	
	long long N;
	int zero = 0;
	int ans = 1;
	vector<long long> A;
	
	cin>>N;
	
	A.resize(N);
	
	for(int i = 0; i < N; i++){
		cin>>A[i];
		if(A[i] == 0) zero++;
	}
	
	if(zero >= 1) {
		cout<<-1<<endl;
		return 0;
	}
	

	for(int i = 0; i < N; i++){
		int t = power(A[i], A[i]);
		
		if(t == -1) {
			if(ans == 0){
				cout<<-1<<endl;
				return 0;
			}
			cout<<(long long)MOD<<endl;
			return 0;
		}
		
		ans *= t;
		
		if(ans > MOD) {
			// exit(2);
			if(ans == 0){
				cout<<-1<<endl;
				return 0;
			}
			cout<<(long long)MOD<<endl;
			return 0;
		}
	}
	if(ans == 0){
		cout<<-1<<endl;
		return 0;
	}
	
	long long hoge = (MOD%((long long)ans));
	cout<<hoge<<endl;
	return 0;
	
	if(hoge != 0) {
		// exit(2);
		cout<<hoge<<endl;
	} else cout<<-1<<endl;
	
	return 0;
}