n,k=map(int,input().split())
a=list(map(int,input().split()))
a.sort(reverse=1)
ans=0
for i in range(1<<(n-1)):
    kk=k
    for j in range(n-1):
        if i&(1<<(n-2-j)):
            kk=a[i]
    ans=max(ans,kk)
print(ans)