<?php
/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/

fscanf(STDIN, "%d",
    $n // the number of temperatures to analyse
);
$temps = stream_get_line(STDIN, 256 + 1, "\n"); // the n temperatures expressed as integers ranging from -273 to 5526
$temps_arr = explode(" ", $temps);
// Write an action using echo(). DON'T FORGET THE TRAILING \n
// To debug (equivalent to var_dump): error_log(var_export($var, true));

//echo("result\n");

//print_r($temps_arr);

$temps_int_arr=[];
foreach ($temps_arr as $key=>$value)
{
    $temps_int_arr1[]=(int)$value;
    $temps_int_arr[]=abs((int)$value);
}

$min=array_search(min($temps_int_arr),$temps_int_arr);

if ( array_search(-$temps_int_arr[$min],  $temps_int_arr1)==false )
{
    echo($temps_int_arr[$min]."\n");
}
else {
    echo(-$temps_int_arr[$min]."\n");
    }

?>