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using System;
using System.Linq;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Generic;

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
class Solution
{
    static void Main(string[] args)
    {   int closestNumber = 5600;
        int n = int.Parse(Console.ReadLine()); // the number of temperatures to analyse
        string[] inputs = Console.ReadLine().Split(' ');
        for (int i = 0; i < n; i++)
        {
            int t = int.Parse(inputs[i]); // a temperature expressed as an integer ranging from -273 to 5526

         #If new t value's absolute value is smalller, it is closer to zero       
            if(Math.Abs(closestNumber)>Math.Abs(t))
            {
                closestNumber = t;
            }
          #If new t value's absolute value is equal, pick the higher one. 
            else if (Math.Abs(closestNumber)==Math.Abs(t))
            {
                closestNumber = Math.Max(closestNumber, t);
            }
            

        }
        #If no values are provided, closestNumber values stays the same as we have given thus we return zero
            if(closestNumber == 5600)
            {
            closestNumber = 0;
            }
        // Write an action using Console.WriteLine()
        // To debug: Console.Error.WriteLine("Debug messages...");
        
        Console.WriteLine(closestNumber);
    }
}