#include <bits/stdc++.h>

int ri() {
	int n;
	scanf("%d", &n);
	return n;
}


int main() {
	int k = ri();
	int64_t n;
	std::cin >> n;
	std::vector<int64_t> a(k);
	int64_t b[k];
	for (auto &i : a) std::cin >> i;
	for (auto &i : b) std::cin >> i;

	for (int i = 0; i < 10; i++) {
		for (int j = 0; j < k; j++) {
			int index = i * k + j;
			int64_t next = -1000000000000000001;
			for (int l = 0; l < k; l++) next = std::max(next, std::min(b[l], a[index + l]));
			a.push_back(next);
		}
	}
	
	if (n < (int) a.size()) {
		printf("%" PRId64 "\n", a[n]);
		return 0;
	} else {
		for (int i = 1; i <= k; i++) {
			bool ok = true;
			for (int j = a.size() - i - i; j < (int) a.size() - i; j++) if (a[j] != a[j + i]) {
				ok = false;
				break;
			}
			if (ok) {
				int left = (n - (a.size() - i)) % i;
				printf("%" PRId64 "\n", a[a.size() - i + left]);
				return 0;
			}
		}
	}
	
	
	return 0;
}