April Fools Contest 2017 C

Description

DO YOU EXPECT ME TO FIND THIS OUT?

WHAT BASE AND/XOR LANGUAGE INCLUDES string?

DON'T BYTE OF MORE THAN YOU CAN CHEW

YOU CAN ONLY DISTORT THE LARGEST OF MATHEMATICS SO FAR

SAYING "ABRACADABRA" WITHOUT A MAGIC AND WON'T DO YOU ANY GOOD

THE LAST STACK RUPTURES. ALL DIE. OH, THE EMBARRASSMENT!

I HAVE NO ARRAY AND I MUST SCREAM

ELEMENTS MAY NOT BE STORED IN WEST HYPERSPACE

Input

The first line of input data contains a single integer n (1 ≤ n ≤ 10).

The second line of input data contains n space-separated integers ai (1 ≤ a_i ≤ 11).

Output

Output a single integer.

Example

input

4
2 5 3 1

output

4
哇啊啦啦啦哇啦啦，然后知道这是个把每句其中几个字取出来，组合在一起，就是最大值和最后一个数异或

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int n,x,mx=0;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++)
        cin>>x,mx=max(mx,x);
    cout<<(x^mx);
    return 0;
}