{
	last if $len == 0;  $a+= $k[0];
	last if $len == 1;  $a+= $k[1]  <<8;
	last if $len == 2;  $a+= $k[2]  <<16;
	last if $len == 3;  $a+= $k[3]  <<24;
	last if $len == 4;  $b+= $k[4];
	last if $len == 5;  $b+= $k[5]  <<8;
	last if $len == 6;  $b+= $k[6]  <<16;
	last if $len == 7;  $b+= $k[7]  <<24;
	last if $len == 8;  $c+= $k[8]  <<8;
	last if $len == 9;  $c+= $k[9]  <<16;
	last if $len == 10; $c+= $k[10] <<24;
}