#include<bits/stdc++.h>
using namespace std;
int n,ming[1000100],an[1000100],ans=0;
int main(){
    freopen("XORcipher.in","r",stdin);
    freopen("XORcipher.out","w",stdout);
    cin>>n;
    for(int i=1;i<=n;i++)cin>>ming[i];
    for(int i=1;i<=n;i++)cin>>an[i];
    ans=ming[1]^an[1];
    for(int i=2;i<=n;i++){
        ans=ans^ming[i];
        ans=ans^an[i];
    }
    cout<<ans<<endl;
    return 0;
}