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@ 2015-10-28T10:32:12Z

<?php

fscanf(STDIN, "%d", $n);
$c = 0;
for($i=1;$i<=$n;$i++) {
if($i % 2 == 0 )continue;
$c += substr_count($i, 1);
}

echo $c . "\n";

Output
Performance
VLD
References
Branches

fscanf: documentation ( source)
substr_count: documentation ( source)

preferences:dark modelive preview

20.43 ms | 402 KiB | 5 Q