$1=1
$2=N/K
$2=$2+2
$8=N*N
$9=K*N

while$1<$2
$3=$1+$2
$3=$3+1
$3=$3/2
$5=$3+$9
$5=$5*$3
if$5>$8
$2=$3
$2=$2-1
end
if$5<=$8
$1=$3
end
end
$1=$1+N
return$1