04. Metric Converter

<?php

$value = floatval(readline());
$input = readline();
$output = readline();

if ($input === "mm") {
    $value /= 1000;
} else if ($input === "cm") {
    $value /= 100;
}

if ($output === "mm") {
    $value *= 1000;
} else if ($output === "cm") {
    $value *= 100;
}

echo number_format($value, 3, ".", "");