#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ull=unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int K;
ll N;
vector<ll> A,B;

int main(){
  scanf("%d%lld",&K,&N);
  A.resize(K); rep(i,K) scanf("%lld",&A[i]);
  B.resize(K); rep(i,K) scanf("%lld",&B[i]);
  if(N<K){ printf("%lld\n",A[N]); return 0; }
  ll ans=0;
  rep(i,K) rep(j,K) if(N%(K-j)==i%(K-j)) ans=max(ans,min(A[i],B[j]));
  printf("%lld\n",ans);
  return 0;
}