<?php
fscanf(STDIN, "%d %d", $M, $N);
$acumuladorM = $M;
$acumuladorN = $N;
// calcula $M fatorial
if ($M == 0 || $M == 1) {
$acumuladorM = 1;
} else {
for ($i = $M; $i > 1; $i--) {
$acumuladorM *= ($i - 1);
}
}
// calcula $N fatorial
if ($N == 0 || $N == 1) {
$acumuladorN = 1;
} else {
for ($i = $N; $i > 1; $i--) {
$acumuladorN *= ($i - 1);
}
}
echo $acumuladorM + $acumuladorN."\n";
?>
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