#include<bits/stdc++.h>
using namespace std;
#define endl "\n"
#define ll long long 
#define mod 1000000007
#define db1(x)  cerr <<#x<<"="<<x<<'\n'
#define db2(x,y)  cerr <<#x<<"="<<x<<" , "<<#y<<"="<<y<<'\n'
#define db3(x,y,z)  cerr <<#x<<"="<<x<<" , "<<#y<<"="<<y<<" , "<<#z<<"="<<z<<'\n'
int main()
{
 ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
   #ifndef ONLINE_JUDGE
           freopen("input","r",stdin);
           freopen("output","w",stdout);
   #endif

       ll n,k,v,ans=0;
    cin>>n>>k;
    vector<ll> a(n);
    for(int i=0;i<n;i++){
        cin>>a[i];
        ans^=a[i];
    }
    a.push_back(ans);
    cout<<a[(k-1)%(n+1)]<<endl;
       return 0;
}