#include <iostream>
#include <fstream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <cmath>
#include <unordered_map>
#include <map>
#include <queue>
#include <string>
#include <set>
#include <list>
#include <climits>
#include <bitset>
#include <numeric>
#include <cassert>
#include <regex>
using std::cout;
using std::cin;
using std::string;
using std::vector;

int main()
{
    int n;
    long long k;
    cin >> n >> k;
    k--;
    k %= (n+1);
    vector<long long> arr(n);
    for (int i = 0; i < n; i++)
    {
        cin >> arr[i];
    }
    if (k == n)
    {
        long long ans = 0;
        for (int i = 0; i < n; i++)
        {
            ans ^= arr[i];
        }
        cout << ans;
    }
    else
    {
        cout << arr[k];
    }
}