<?
$sum = 0;
$arr[0]=array(08,02,22,97,38,15,00,40,00,75,04,05,07,78,52,12,50,77,91,08);
$arr[1]=array(49,49,99,40,17,81,18,57,60,87,17,40,98,43,69,48,04,56,62,00);
$arr[2]=array(81,49,31,73,55,79,14,29,93,71,40,67,53,88,30,03,49,13,36,65);
$arr[3]=array(52,70,95,23,04,60,11,42,69,24,68,56,01,32,56,71,37,02,36,91);
$arr[4]=array(22,31,16,71,51,67,63,89,41,92,36,54,22,40,40,28,66,33,13,80);
$arr[5]=array(24,47,32,60,99,03,45,02,44,75,33,53,78,36,84,20,35,17,12,50);
$arr[6]=array(32,98,81,28,64,23,67,10,26,38,40,67,59,54,70,66,18,38,64,70);
$arr[7]=array(67,26,20,68,02,62,12,20,95,63,94,39,63,08,40,91,66,49,94,21);
$arr[8]=array(24,55,58,05,66,73,99,26,97,17,78,78,96,83,14,88,34,89,63,72);
$arr[9]=array(21,36,23,09,75,00,76,44,20,45,35,14,00,61,33,97,34,31,33,95);
$arr[10]=array(78,17,53,28,22,75,31,67,15,94,03,80,04,62,16,14,09,53,56,92);
$arr[11]=array(16,39,05,42,96,35,31,47,55,58,88,24,00,17,54,24,36,29,85,57);
$arr[12]=array(86,56,00,48,35,71,89,07,05,44,44,37,44,60,21,58,51,54,17,58);
$arr[13]=array(19,80,81,68,05,94,47,69,28,73,92,13,86,52,17,77,04,89,55,40);
$arr[14]=array(04,52,08,83,97,35,99,16,07,97,57,32,16,26,26,79,33,27,98,66);
$arr[15]=array(88,36,68,87,57,62,20,72,03,46,33,67,46,55,12,32,63,93,53,69);
$arr[16]=array(04,42,16,73,38,25,39,11,24,94,72,18,08,46,29,32,40,62,76,36);
$arr[17]=array(20,69,36,41,72,30,23,88,34,62,99,69,82,67,59,85,74,04,36,16);
$arr[18]=array(20,73,35,29,78,31,90,01,74,31,49,71,48,86,81,16,23,57,05,54);
$arr[19]=array(01,70,54,71,83,51,54,69,16,92,33,48,61,43,52,01,89,19,67,48);

for($i=0;$i<20;$i++)
{
        for($j=0; $j<20; $j++)
        {
                # diagonal right
                if($j<17 && $i<17)
                {
                        $n = $arr[$i][$j] * $arr[$i+1][$j+1] * $arr[$i+2][$j+2] * $arr[$i+3][$j+3];
                        $n > $sum ? $sum = $n : null;
                }
                # diagonal left
                if($j>3 && $i<17)
                {
                        $n = $arr[$i][$j] * $arr[$i+1][$j-1] * $arr[$i+2][$j-2] * $arr[$i+3][$j-3];
                        $n > $sum ? $sum = $n : null;
                }
                #straight across
                if($j < 17)
                {
                        $n = $arr[$i][$j] * $arr[$i][$j+1] * $arr[$i][$j+2] * $arr[$i][$j+3];
                        $n > $sum ? $sum = $n : null;
                }
        }
}

echo $sum;

?>