#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<numeric>
#include<cmath>
#include<utility>
#include<tuple>
#include<cstdint>
#include<cstdio>
#include<iomanip>
#include<map>
#include<queue>
#include<set>
#include<stack>
#include<deque>
#include<unordered_map>
#include<unordered_set>
#include<bitset>
#include<cctype>
#include<chrono>
#include<random>
#include<cassert>
#include<cstddef>
#include<iterator>
#include<string_view>
#include<type_traits>

#ifdef LOCAL
#  include "debug_print.hpp"
#  define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define debug(...) (static_cast<void>(0))
#endif

using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
#define rrep(i,n) for(int i=(n)-1; i>=0; i--)
#define FOR(i,a,b) for(int i=(a); i<(b); i++)
#define RFOR(i,a,b) for(int i=(b-1); i>=(a); i--)
#define ALL(v) v.begin(), v.end()
#define RALL(v) v.rbegin(), v.rend()
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );
#define pb push_back
using ll = long long;
using D = double;
using LD = long double;
using P = pair<int, int>;
template<typename T> using PQ = priority_queue<T,vector<T>>;
template<typename T> using minPQ = priority_queue<T, vector<T>, greater<T>>;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
void yesno(bool flag) {cout << (flag?"Yes":"No") << "\n";}

template<typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &p) {
    os << p.first << " " << p.second;
    return os;
}
template<typename T, typename U>
istream &operator>>(istream &is, pair<T, U> &p) {
    is >> p.first >> p.second;
    return is;
}

template<typename T>
ostream &operator<<(ostream &os, const vector<T> &v) {
    int s = (int)v.size();
    for (int i = 0; i < s; i++) os << (i ? " " : "") << v[i];
    return os;
}
template<typename T>
istream &operator>>(istream &is, vector<T> &v) {
    for (auto &x : v) is >> x;
    return is;
}
void in() {}
template<typename T, class... U>
void in(T &t, U &...u) {
    cin >> t;
    in(u...);
}
void out() { cout << "\n"; }
template<typename T, class... U, char sep = ' '>
void out(const T &t, const U &...u) {
    cout << t;
    if (sizeof...(u)) cout << sep;
    out(u...);
}
void outr() {}
template<typename T, class... U, char sep = ' '>
void outr(const T &t, const U &...u) {
    cout << t;
    outr(u...);
}

constexpr ll inf = 1e18;

template<typename T>
struct Kitamasa{
    vector<T> a;    // 初期値ベクトル
    vector<T> d;    // 係数ベクトル
    int k;

    Kitamasa(vector<T>& a, vector<T>& d) : a(a), d(d), k((int)a.size()) {}

    // a_n の係数ベクトルを求める
    vector<T> dfs(int64_t n){
        if(n == k)  return d;

        vector<T> res(k,-inf);
        if(n & 1 || n < k * 2){
            vector<T> x = dfs(n - 1);
            for(int i = 0; i < k; ++i)  res[i] = min(d[i], x[k - 1]);
            for(int i = 0; i + 1 < k; ++i)  chmax(res[i + 1], x[i]);
        }
        else{
            vector<vector<T>> x(k, vector<T>(k));
            x[0] = dfs(n >> 1);
            for(int i = 0; i + 1 < k; ++i){
                for(int j = 0; j < k; ++j)  x[i + 1][j] = min(d[j], x[i][k - 1]);
                for(int j = 0; j + 1 < k; ++j)  chmax(x[i + 1][j + 1], x[i][j]);
            }
            for(int i = 0; i < k; ++i){
                for(int j = 0; j < k; ++j){
                    chmax(res[j], min(x[0][i], x[i][j]));
                }
            }
        }

        return res;
    }

    // a_n を求める
    T calc(int64_t n){
        vector<T> x = dfs(n);
        T res = -inf;
        for(int i = 0; i < k; ++i)  chmax(res, min(x[i],a[i]));
        return res;
    }
};

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int k; ll n; in(k,n);
    vector<ll> a(k),b(k); in(a,b);
    if(n < k){
        out(a[n]);
        return 0;
    }
    Kitamasa<ll> km(a,b);
    out(km.calc(n));
}