read n
read a
read B
read c
read D

for i in $B;{ y[i]+=\ $i;};B=(${y[@]})
for i in $D;{ z[i]+=\ $i;};D=(${z[@]})

for((;n--;r+=k,k=0)){
	((${#b[@]}))||b=(${B[@]})
	((${#d[@]}))||d=(${D[@]})
	(((nb=${#b[@]})<(nd=${#d[@]})))&&{
		x=${b[-1]}
		b=(${b[@]::nb-1})
		for((j=nd-1,i=0;i<nd;++i)){
			((x>d[i]&&(k=1,j=i)))
		}
		d=(${d[@]::j} ${d[@]:j+1})
	}||{
		x=${d[0]}
		d=(${d[@]:1})
		for((j=0,i=nb;i--;)){
			((x<b[i]&&(k=1,j=i)))
		}
		b=(${b[@]::j} ${b[@]:j+1})
	}
}

echo $r