#include<bits/stdc++.h>
#define int long long
#define N (1145141)
#define mod (1000000007)
#define INF (LONG_LONG_MAX-50)
#define pb push_back
#define fo(i,a,b) for(int i=a;i<=b;i++)
#define foa(ii,aa) for(auto ii:aa)
#define PII pair<int,int>
#define fi first
#define se second
#define mid ((l+r)>>1)
#define debug printf("HERE!\n")
using namespace std;
template<typename T>inline void read(T &FF){;
    T RR=1;FF=0;char CH=getchar();
    for(;!isdigit(CH);CH=getchar())if(CH=='-')RR=-1;
    for(;isdigit(CH);CH=getchar())FF=(FF<<1)+(FF<<3)+(CH^48);
    FF*=RR;
}
template<typename T>void write(T x){
    if(x<0)putchar('-'),x*=-1;
    if(x>9)write(x/10);
    putchar(x%10+48);
}

int n;
int a,b,ans;

signed main(){
    freopen("XORcipher.in","r",stdin);freopen("XORcipher.out","w",stdout);
    read(n);
    fo(i,1,n){
        read(a);ans^=a;
    }
    fo(i,1,n){
        read(b);ans^=b;
    }
    write(ans);
    return 0;
}