$1=1
$3=K*N
$4=N*N
$2=17446744073709551615/$3
if$2>N
$2=N
end
while$1<$2
$5=$0+$2
$5=$5/2
$6=$3+$5
$6=$5*$6
if$6>$4
$2=$5
end
if$6<=$4
$0=$5
$1=$5+1
end
end
$0=$0+N
return$0