#include <iostream>
#include <map>
#include <ctime>
#include <cmath>
#include <queue>
#include <vector>
#include <string>
#include <algorithm>
#include <functional>
using namespace std;
#pragma warning (disable: 4996)

int K;
long long N;
int A[1 << 22], B[1 << 22], C[1 << 22];
long long QA[1 << 22], QB[1 << 22];

int main() {
	// Crazy Solution
	// Step #1. 入力
	cin >> K >> N;
	for (int i = 0; i < K; i++) cin >> QA[i];
	for (int i = 0; i < K; i++) cin >> QB[i];

	// Step #2. 座標圧縮
	vector<long long> X;
	for (int i = 0; i < K; i++) X.push_back(QA[i]);
	for (int i = 0; i < K; i++) X.push_back(QB[i]);
	sort(X.begin(), X.end());
	X.erase(unique(X.begin(), X.end()), X.end());
	for (int i = 0; i < K; i++) A[i] = lower_bound(X.begin(), X.end(), QA[i]) - X.begin();
	for (int i = 0; i < K; i++) B[i] = lower_bound(X.begin(), X.end(), QB[i]) - X.begin();
	for (int i = 0; i < K; i++) C[K - i] = B[i];

	// Step #3. 愚直解
	long long rem = min(N, 1LL * K * K);
	for (int i = K; i <= rem; i++) A[i] = -1;
	for (int i = 0; i <= K; i++) {
		for (int j = 1; j <= K; j++) {
			if (i + j < K) continue;
			A[i + j] = max(A[i + j], min(A[i], C[j]));
		}
	}
	for (int i = K; i <= rem; i++) {
		for (int j = 1; j <= K; j++) {
			A[i + j] = max(A[i + j], min(A[i], C[j]));
		}
	}
	if (rem == N) {
		cout << X[A[N]] << endl;
		return 0;
	}
	
	// Step #4. 周期を見る
	long long pr = -1;
	for (long long i = rem - 1; i >= K; i--) {
		bool flag = false;
		for (int j = 0; j < K; j++) {
			if (A[rem - K + j] != A[i - K + j]) { flag = true; break; }
		}
		if (flag == false) { pr = rem - i; break; }
	}
	
	// Step #5. 答えを出力
	long long idx = (rem - pr) + (N - rem) % pr;
	cout << X[A[idx]] << endl;
	return 0;
}