#include<bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    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;
}