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


int main()
{
    int n,k,m;
    cin>>n>>k>>m;
    int a[n];
    for (int i = 0; i < n; i++) {
        cin>>a[i];
    }
    ll val=pow(11,(ll)k);
    string s=to_string(val);
    int res=0;
    for (int i = m; i <= k+m+1; i++) {
          if((int)s[i-m]%2)
            res^=a[i];
    }
    cout<<res<<endl;
    return 0;
}