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# Author Problem Lang Verdict Time Memory Sent Judged  
113388721 Practice:
ExeW 		486A - 24 PHP Wrong answer on test 5 31 ms 8 KB 2021-04-18 10:19:48 2021-04-18 10:19:48
→ Source 
<?php 
    $n = trim(fgets(STDIN));
    $result = 0;

    if($n%2 == 0){
        $result = $n / 2;
    }else{
        $result = (($n-1) / 2) - $n;
    }
        
    echo number_format($result,0,null,"");
    
?>
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