<?php

$handle = fopen ("php://stdin","r");
fscanf($handle,"%d %d %d",$n1,$n2,$n3);
$h1_temp = fgets($handle);
$h1 = explode(" ",$h1_temp);
array_walk($h1,'intval');
$h2_temp = fgets($handle);
$h2 = explode(" ",$h2_temp);
array_walk($h2,'intval');
$h3_temp = fgets($handle);
$h3 = explode(" ",$h3_temp);
array_walk($h3,'intval');

// My code start here

$sum = array(array_sum($h1), array_sum($h2), array_sum($h3));
$arr = array($h1, $h2, $h3);

while( $sum[0] !== $sum[1] || $sum[0] !== $sum[2]){
    $max = array_search(max($sum),$sum);
    $sum[$max] -= array_shift($arr[$max]);
}
echo $sum[0];

?>