<?php

$handle = fopen ("php://stdin","r");
fscanf($handle,"%d %d",$n,$m);

function biggest($m, $n) {
	if($m > $n) $big = $m;
	if($n > $m) $big = $n;
	if($n == $m) $big = $m;
	return $big;
}

function smallest($m, $n) {
	if($m < $n) $small = $m;
	if($n < $m) $small = $n;
	if($n == $m) $small = $m;
	return $small;
}

function nrCuts($m, $n) {
	if (($m ==1) OR ($n == 1)){
		$x = abs($m - $n);
	} else {
		$biggest = biggest($m, $n);
		$smallest = smallest($m, $n);
		$x = ($biggest -1) * $smallest;
	}
	return $x;
}

echo nrCuts($m, $n);

?>