import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")

k,n = list(map(int, input().split()))
a = list(map(int, input().split()))
b = list(map(int, input().split()))
def sub(a,b):
    return max([min(a[i], b[i]) for i in range(k)])
l = a[:]
for i in range(100*k+1):
    l.append(sub(l[-k:], b))
if n<len(l):
    print(l[n])
else:
    tmp = l[-k:]
    print(tmp[(n-len(l))%k])