#include<iostream>
#include<algorithm>
using namespace std;
int n,a[500005],b[500005];
int main(){
	scanf("%d",&n);
	for(int i=1;i<=n;i++)scanf("%d",&a[i]);
	for(int i=1;i<=n;i++)scanf("%d",&b[i]);
	sort(a+1,a+n+1);
	sort(b+1,b+n+1);
	printf("%d",a[n]+b[n]);
	return 0;
}