$1=N/K
$2=K*N
$3=N*N
while$0<$1
  $4=$0+$1
  $4=$4+1
  $4=$4/2
  $5=$2+$4
  $5=$4*$5
  if$5>$3
    $1=$4-1
  end
  if$5<=$3
    $0=$4
  end
end
$0=$0+N
return$0