#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 10000000000000


int main(){
	
	int N;
	cin>>N;
	vector<int> c1(2,0),c2(2,0);
	int n = N;
	rep(i,2){
		rep(j,N){
			int a;
			cin>>a;
			if(a==1)c1[i]++;
			else if(a==2)c2[i]++;
			else n--;
		}
	}
	
	int ans = N*(c2[0]+c2[1]) - (c2[0]*c2[1]);
	
	if(c2[0]!=0)c1[1]=0;
	if(c2[1]!=0)c1[0]=0;
	ans += max(c1[0],c1[1]);
	
	
	cout<<ans<<endl;
			
    return 0;
}