<?php

pro2();

function pro2()
{
	$str = trim(fgets(STDIN));
	list ($a, $b) = explode(' ', $str);

	$res = $a % 100 == 0 && $b % 100 == 0 && test($a) && test($b);
	if ($res) {
		$answer = $a * $b / 10;
	} else {
		$answer = $a * $b;
		if ($answer < -99999999 || $answer > 99999999) {
			$answer = 'E';
		}
	}

	echo $answer . PHP_EOL;
}

function test($num)
{
	while (true) {
		$num /= 10;
		if ($num % 10 != 0) {
			break;
		}
	}

	return ($num >= 1 && $num <= 9);
}