#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<algorithm>
#include<utility>
#define N 
#define int long long
#define mem(x) memset(x,0,sizeof(x))
#define fo(i,l,r) for(int i=l;i<=r;i++)
#define rf(i,r,l) for(int i=r;i>=l;i--)
using namespace std;
int n,m,k,op,ans,x,y,z;
void swap(int &x,int &y){int t=x;x=y;y=t;}
int max(int x,int y){return x>y?x:y;}
int min(int x,int y){return x<y?x:y;}
void ckmax(int &x,int y){if(y>x)x=y;}
void ckmin(int &x,int y){if(y<x)x=y;}
int read(){
    int sum=0;bool f=0;char c=getchar();
    for(;c<48||c>57;c=getchar())if(c==45)f=1;
    for(;c>=48&&c<=57;c=getchar())sum=sum*10+(c&15);
    return f?-sum:sum;
}
signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    freopen("XORcipher.in","r",stdin);freopen("XORcipher.out","w",stdout);
    n=read();
    fo(i,1,n)ans^=read();
    while(n--)ans^=read();
    printf("%lld",ans);
    return 0;
}