<?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 = explode(' ', stream_get_line(STDIN, 256, "\n")); // the N temperatures expressed as integers ranging from -273 to 5526

$key = null;
$diff = null;

if (count($TEMPS) === 1) {
    echo "0\n";
}

foreach ($TEMPS as $k => $v) {
    $d = abs((int) $v);
    
    if ($diff === null) {
       $key = $k;
       $diff = $d;
       continue;
    }
    
    if ($d === $diff && $v > $TEMPS[$key]) {
        $key = $k;
        $diff = $d;
        continue;
    }
    
    if ($d < $diff) {
        $key = $k;
        $diff = $d;
    }
}

// Write an action using echo(). DON'T FORGET THE TRAILING \n
// To debug (equivalent to var_dump): error_log(var_export($var, true));

echo $TEMPS[$key], "\n";

?>