K, N = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))

def calc():
    res = -10**18
    for i in range(1, K+1):
        res = max(res, min(A[-i], B[-i]))
    return res

for _ in range(3*K+1):
    A.append(calc())


try:
    print(A[N])
except:
    memo = []
    for a in A[::-1]:
        if memo and memo[0]==a:
            break
        memo.append(a)
    m = len(memo)
    n = len(A)
    d = N+1 - n
    d %= m
    print(memo[::-1][d-1])