$0=N
$1=2*N
$2=K+2
$1=$1/$2
$2=N*N
$3=N*K
while$1<$0
$0=$1
$4=$1*$1
$1=2*$1
$4=$4+$2
$1=$1+$3
$1=$4/$1
end
$0=$0+N
return$0