$1=0
$2=N/K
$2=$2+2
$8=N*N
$9=K*N
$4=6
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
$4=$4+15
end
$1=$1+N
$5=1000000007
$4=$4+2
$6=998244353
while$4<900
$5=$5*$6
$5=$5/$6
$4=$4+4
end
return$1