sub max{$_[0]>$_[1]?$_[0]:$_[1]}
sub min{$_[0]<$_[1]?$_[0]:$_[1]}
($g,$c,$p)=<>=~/\d+/g;
$_=<>;
$G=y/G//;
$C=y/C//;
$P=y/P//;
$x=min($p,$G);
$s+=$x*3;
$p-=$x;
$G-=$x;
$x=min($g,$C);
$s+=$x*3;
$g-=$x;
$C-=$x;
$x=min($c,$P);
$s+=$x*3;
$c-=$x;
$P-=$x;
$s+=min($g,$G)+min($c,$C)+min($p,$P);
print$s;