#include <bits/stdc++.h>

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


int main() {
	int k = ri();
	int64_t n;
	std::cin >> n;
	int64_t a[k];
	int64_t b[k];
	for (auto &i : a) std::cin >> i;
	for (auto &i : b) std::cin >> i;
	
	if (n < k) {
		printf("%" PRId64 "\n", a[n]);
		return 0;
	}
	
	std::vector<std::vector<int64_t> > mat(k, std::vector<int64_t>(k, -1000000000000000000));
	for (int i = 0; i < k; i++) {
		mat[i][k - 1] = b[i];
		if (i) mat[i][i - 1] = 1000000000000000000;
	}
	
	n -= (k - 1);
	for (; n; n >>= 1) {
		if (n & 1) {
			int64_t next[k];
			for (auto &i : next) i = -1000000000000000000;
			for (int i = 0; i < k; i++) {
				for (int j = 0; j < k; j++) next[j] = std::max(next[j], std::min(a[i], mat[i][j]));
			}
			memcpy(a, next, sizeof(next));
		}
		std::vector<std::vector<int64_t> > next(k, std::vector<int64_t>(k, -1000000000000000000));
		for (int i = 0; i < k; i++) {
			for (int j = 0; j < k; j++) {
				for (int l = 0; l < k; l++) {
					next[i][l] = std::max(next[i][l], std::min(mat[i][j], mat[j][l]));
				}
			}
		}
		mat = next;
	}
	printf("%" PRId64 "\n", a[k - 1]);
	
	
	return 0;
}