K, N = map(int, input().split())

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

n = min(K*3+N%K, N)

for i in range(K,n+1):
    m = -float('inf')
    for j in range(K):
        m = max(m, min(A[i-K+j], B[j]))
    A.append(m)

print(A[n])