CodinGame.com // Temperatures // Easy

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

using namespace std;

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
int main()
{
    int n; // the number of temperatures to analyse
    cin >> n; cin.ignore();
    int temps[n];
    int mark;

    for (int i = 0; i < n; i++) cin >> temps[i];

    sort(temps, temps+n);

    for (int i = 0; i < n; i++)
    {
        if (temps[i] > 0)
        {
            mark = i;
            break;
        }

    }

    if (mark == 0) mark = n-1;

    if (n == 0) cout << n << endl;
    else if (temps[0] == 0 || temps[0] == 1) cout << temps[0] << endl;
    else if (n == 1) cout << temps[0] << endl;
    else if (-1 * temps[mark-1] < temps[mark]) cout << temps[mark-1] << endl;
    else cout << temps[mark] << endl;


   // cout << "result" << endl;
}