using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Threading;

namespace ForATCODER
{
    public class Program
    {
        ///template
        ///
        /// String[] s = Console.ReadLine().Split(' ');
        ///   long[] nk =  s2larray(Console.ReadLine().Split(' '));
        ///  



        public static void Main(string[] args)
        {
            long n = s2i(Console.ReadLine());
            long[] nm = s2larray(Console.ReadLine().Split(" "));
            ulong er = (ulong)Math.Pow(10, 18);
            ulong result = (ulong)nm[0];
            //zero check
            for (long i = 0; i < n; i++)
            {
                if (nm[i] == 0) { RESULT(0); return; };
            }
            for (long i = 1; i < n; i++)
            {
                //check
                ulong sub = er - result;
                double nn =sub/ result;
                if(nn+10 < (ulong) nm[i]) { RESULT(-1); return; };
                result *= (ulong)nm[i];
                if (result < 0 || result > er) { RESULT(-1); return; };
            }
            RESULT(result);
        }

        class TreeNode<T>
        {
            List<TreeNode<T>> Children;

            T Item { get; set; }

            public TreeNode(T item)
            {
                Item = item;
            }

            public TreeNode<T> AddChild(T item)
            {
                TreeNode<T> nodeItem = new TreeNode<T>(item);
                Children.Add(nodeItem);
                return nodeItem;
            }
            public void AddChildRelative(TreeNode<T> item)
            {
                Children.Add(item);
            }
            public List<TreeNode<T>> GetChildren(T val)
            {
                if (val.Equals(Item))
                {
                    var l = new List<TreeNode<T>>();
                    l.Add(this);
                    return l;
                }
                return Children.FindAll(x => x.Item.Equals(val));
            }
        }

        static void addarray(long[] arr, int start, int end)
        {
            for (int i = start; i <= end; i++)
            {
                arr[i]++;
            }
        }
        public static decimal Sqrt(decimal x)
        {
            decimal sqrt_x = (decimal)Math.Sqrt((long)x);
            for (int i = 0; i < 10; ++i)
                sqrt_x = 0.5m * (sqrt_x + x / sqrt_x);
            return sqrt_x;
        }
        static long summ(long s)
        {
            if (s == 1) return 1;
            return s + summ(s - 1);
        }
        public static bool checka(int[] a, int m)
        {
            int back = 1;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] >= 1 && a[i] <= m)
                {
                    if (a[i] >= back)
                    {
                        back = a[i];
                    }
                    else
                    {
                        return false;
                    }
                }
                else
                {
                    return false;
                }
            }
            return true;
        }
        public static ulong pow(int a, int b)
        {
            ulong res = 1;
            for (int i = 0; i < b; i++)
            {
                res *= (ulong)a;
            }
            return res;
        }
        static int s2i(String s)
        {
            return Convert.ToInt32(s);
        }
        static long s2l(String s)
        {
            return Convert.ToInt64(s);
        }
        static void RESULT(double res)
        {
            Console.WriteLine(res);
        }
        static void RESULT(long res)
        {
            Console.WriteLine(res);
        }
        static void RESULT(ulong res)
        {
            Console.WriteLine(res);
        }
        static void RESULT(int res)
        {
            Console.WriteLine(res);
        }
        static void RESULT(String res)
        {
            Console.WriteLine(res);
        }
        static String[] ReadLineAll(int count)
        {
            String[] res = new String[count];
            for (int i = 0; i < count; i++)
            {
                res[i] = Console.ReadLine();
            }
            return res;
        }

        static int[] s2iarray(String[] src)
        {
            int len = src.Length;
            int[] res = new int[len];
            for (int i = 0; i < len; i++)
            {
                res[i] = Convert.ToInt32(src[i]);
            }
            return res;
        }
        static long[] s2larray(String[] src)
        {
            int len = src.Length;
            long[] res = new long[len];
            for (int i = 0; i < len; i++)
            {
                res[i] = Convert.ToInt64(src[i]);
            }
            return res;
        }
        static ulong[] s2larray2(String[] src)
        {
            int len = src.Length;
            ulong[] res = new ulong[len];
            for (int i = 0; i < len; i++)
            {
                res[i] = Convert.ToUInt64(src[i]);
            }
            return res;
        }

        static long C(int n, int r)
        {
            if (n <= 1) return 0;
            if (r > n - r) r = n - r; // because C(n, r) == C(n, n - r)
            long ans = 1;
            int i;

            for (i = 1; i <= r; i++)
            {
                ans *= n - r + i;
                ans /= i;
            }

            return ans;
        }
        static long C(long n, long r)
        {
            if (n <= 1) return 0;
            if (r > n - r) r = n - r; // because C(n, r) == C(n, n - r)
            long ans = 1;
            int i;

            for (i = 1; i <= r; i++)
            {
                ans *= n - r + i;
                ans /= i;
            }

            return ans;
        }
        static ulong C(ulong n, ulong r)
        {
            if (n <= 1) return 0;
            if (r > n - r) r = n - r; // because C(n, r) == C(n, n - r)
            ulong ans = 1;
            ulong i;

            for (i = 1; i <= r; i++)
            {
                ans *= n - r + i;
                ans /= i;
            }

            return ans;
        }


    }

}


Measured memory_bytes: 41272