#include <iostream>
#include <vector>
#include <algorithm>
#include <array>
#include <iterator>
#include <string>
#include <cctype>
#include <cstring>
#include <cstdlib>
#include <cassert>
#include <cmath>
#include <ctime>
#include <iomanip>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <bitset>
#include <random>
#include <utility>
#include <functional>
using namespace std;
using ull = unsigned long long;

ull seed;
int next() {
    seed = seed ^ (seed << 13);
    seed = seed ^ (seed >> 7);
    seed = seed ^ (seed << 17);
    return (seed >> 33);
}
void Main()
{
	int N,Q;
	cin >> N >> Q >> seed;
	for(int i = 0;i < (int)1e4;i++)
	{
		next();
	}
	vector<int> A(N);
	for(int i = 0;i < N;i++)
	{
		A[i] = next();
	}
	sort(A.begin(),A.end());
	ull ans = 0;
	const int B = 2 * N;
	for(int i = 0;i < Q;i += B)
	{
		int ri = min(Q,i + B);
		vector<pair<int,int>> X(ri - i);
		for(int j = 0;j < ri - i;j++)
		{
			X[j].first = next();
			X[j].second = i + j;
		}
		sort(X.begin(),X.end());
		int k = 0;
		for(int j = 0;j < ri - i;j++)
		{
			while(k < N && A[k] < X[j].first)
			{
				k++;
			}
			ans ^= (ull) k * X[j].second;
		}
	}
	cout << ans << "\n";
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	/* cin >> tt; */
	while(tt--) Main();
}