$n=<>;
$a=<>;
@b1=sort{$a<=>$b}<>=~/\d+/g;
$c=<>;
@d1=sort{$b<=>$a}<>=~/\d+/g;
$win=0;

for$i(0..$n-1){
    if(!@b){
        @b=@b1;
    }
    if(!@d){
        @d=@d1;
    }
    if(@b<@d){
        $b=pop@b;
        @r=grep{$b>$d[$_]}0..@d-1;
        if(@r){
            $win++;
            splice(@d,$r[0],1);
        }else{
            splice(@d,0,1);
        }
        if(!@b){
            @b=@b1;
        }
    }else{
        $d=pop@d;
        @r=grep{$b[$_]>$d}0..@b-1;
        if(@r){
            $win++;
            splice(@b,$r[0],1);
        }else{
            splice(@b,0,1);
        }
    }
}
print$win;