import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.*;



public class Main {
	static final long MOD=1000000007;
	static final long MOD1=998244353;
	static int size = 0;
	static long MAX = 1000000000000000000l;
	public static void main(String[] args){
		PrintWriter out = new PrintWriter(System.out);
		InputReader sc=new InputReader(System.in);
		int k = sc.nextInt();
		long n = sc.nextLong();
		long[] init = sc.nextLongArray(k);
		long[] a = sc.nextLongArray(k);
		kitamasa KITA = new kitamasa(k, a);
		System.out.println(KITA.calc(init, n));
   	}
	//きたまさ法, k項間線形漸化式の第n項をO(k^2logn)で求める
	//注) aもinitも小さい順に入れていく、a_k = c_k-1*a_k-1 + .... + c_0*a_0 なら添え字の通りにいれる  
	//0index-dで0~k-1項を初項として計算する
	//コンストラクタに漸化式の係数を与えて初期化。calcで初項を与えて計算する。
	static class kitamasa{
		int k;
		long[] a;
		public kitamasa(int k, long[] a) {
			this.k = k;
			this.a = new long[k];
			for (int i = 0; i < a.length; i++) {
				this.a[i] = a[i];
			}
		}
		long[] dfs(long n){
	        if(n == k)  return a;
	        long[] res = new long[k];
	        Arrays.fill(res, Long.MIN_VALUE);
	        if((n & 1) == 1 || n < k * 2){
	            long[] x = dfs(n - 1);
	            oneplus(res, x);
	        }
	        else{
	        	long[][] x = new long[k][k];
	        	for (int i = 0; i < x.length; i++) {
					Arrays.fill(x[i], Long.MIN_VALUE);
				}
	            x[0] = dfs(n >> 1);
	            for(int i = 0; i + 1 < k; i++){
	            	oneplus(x[i+1], x[i]);
	            }
	            for(int i = 0; i < k; i++){
	                for(int j = 0; j < k; j++){
	                    res[j] = Math.max(res[j], Math.min(x[0][i] , x[i][j]));
	                }
	            }
	        }
	        return res;
	    }
		void oneplus(long[] res, long[] x) {
			for(int i = 0; i < k; i++)  res[i] = Math.min(a[i] , x[k - 1]);
	        for(int i = 0; i + 1 < k; i++)  res[i + 1] = Math.max(res[i + 1] , x[i]);
		}
		long calc(long[] init, long n) {
			if(n<k) return init[(int)n];
			long[] x = dfs(n);//a_nの係数
			long res = Long.MIN_VALUE;
			for (int i = 0; i < k; i++) {
				res = Math.max(res, Math.min(init[i] , x[i]));
			}
			return res;
		}
	}
	static class InputReader { 
		private InputStream in;
		private byte[] buffer = new byte[1024];
		private int curbuf;
		private int lenbuf;
		public InputReader(InputStream in) {
			this.in = in;
			this.curbuf = this.lenbuf = 0;
		}
		public boolean hasNextByte() {
			if (curbuf >= lenbuf) {
				curbuf = 0;
				try {
					lenbuf = in.read(buffer);
				} catch (IOException e) {
					throw new InputMismatchException();
				}
				if (lenbuf <= 0)
					return false;
			}
			return true;
		}
 
		private int readByte() {
			if (hasNextByte())
				return buffer[curbuf++];
			else
				return -1;
		}
 
		private boolean isSpaceChar(int c) {
			return !(c >= 33 && c <= 126);
		}
 
		private void skip() {
			while (hasNextByte() && isSpaceChar(buffer[curbuf]))
				curbuf++;
		}
 
		public boolean hasNext() {
			skip();
			return hasNextByte();
		}
 
		public String next() {
			if (!hasNext())
				throw new NoSuchElementException();
			StringBuilder sb = new StringBuilder();
			int b = readByte();
			while (!isSpaceChar(b)) {
				sb.appendCodePoint(b);
				b = readByte();
			}
			return sb.toString();
		}
 
		public int nextInt() {
			if (!hasNext())
				throw new NoSuchElementException();
			int c = readByte();
			while (isSpaceChar(c))
				c = readByte();
			boolean minus = false;
			if (c == '-') {
				minus = true;
				c = readByte();
			}
			int res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res = res * 10 + c - '0';
				c = readByte();
			} while (!isSpaceChar(c));
			return (minus) ? -res : res;
		}
 
		public long nextLong() {
			if (!hasNext())
				throw new NoSuchElementException();
			int c = readByte();
			while (isSpaceChar(c))
				c = readByte();
			boolean minus = false;
			if (c == '-') {
				minus = true;
				c = readByte();
			}
			long res = 0;
			do {
				if (c < '0' || c > '9')
					throw new InputMismatchException();
				res = res * 10 + c - '0';
				c = readByte();
			} while (!isSpaceChar(c));
			return (minus) ? -res : res;
		}
 
		public double nextDouble() {
			return Double.parseDouble(next());
		}
 
		public int[] nextIntArray(int n) {
			int[] a = new int[n];
			for (int i = 0; i < n; i++)
				a[i] = nextInt();
			return a;
		}
		public double[] nextDoubleArray(int n) {
			double[] a = new double[n];
			for (int i = 0; i < n; i++)
				a[i] = nextDouble();
			return a;
		}
		public long[] nextLongArray(int n) {
			long[] a = new long[n];
			for (int i = 0; i < n; i++)
				a[i] = nextLong();
			return a;
		}
 
		public char[][] nextCharMap(int n, int m) {
			char[][] map = new char[n][m];
			for (int i = 0; i < n; i++)
				map[i] = next().toCharArray();
			return map;
		}
	}
}