You are given *n* numbers *a*<sub class="lower-index">1</sub>, *a*<sub class="lower-index">2</sub>, ..., *a*<sub class="lower-index">*n*</sub>. You can perform at most *k* operations. For each operation you can multiply one of the numbers by *x*. We want to make <img align="middle" class="tex-formula" src="https://espresso.codeforces.com/1faa5be276f646dfb07d2a01bf67449ad72c0ef7.png" style="max-width: 100.0%;max-height: 100.0%;"/> as large as possible, where <img align="middle" class="tex-formula" src="https://espresso.codeforces.com/ddbf6923ea3f08cb83b08ed026f40a80751dff3f.png" style="max-width: 100.0%;max-height: 100.0%;"/> denotes the bitwise OR. 

Find the maximum possible value of <img align="middle" class="tex-formula" src="https://espresso.codeforces.com/1faa5be276f646dfb07d2a01bf67449ad72c0ef7.png" style="max-width: 100.0%;max-height: 100.0%;"/> after performing at most *k* operations optimally.
The first line contains three integers *n*, *k* and *x* (1 ≤ *n* ≤ 200 000, 1 ≤ *k* ≤ 10, 2 ≤ *x* ≤ 8).

The second line contains *n* integers *a*<sub class="lower-index">1</sub>, *a*<sub class="lower-index">2</sub>, ..., *a*<sub class="lower-index">*n*</sub> (0 ≤ *a*<sub class="lower-index">*i*</sub> ≤ 10<sup class="upper-index">9</sup>).
from  sys import stdin
input=stdin.readline
def bt(bit,n):
	lt=bit.copy()
	for i in range(70):
		if (1<<i)&n:
			lt[i]+=1
	return lt
def nbitsub(bit,n):
	lt=bit.copy()
	for i in range(63):
		if (1 << i) & n:
			lt[i] -= 1
	return lt

def get_or(bit):
	res=0
	for i in range(0,len(bit)):
		if bit[i]:
			res+=pow(2,i)
	return res
# print(get_or([0,1,0,1]))
def f(a,k,x):
	bit=[0]*63
	for i in a:
		bit=bt(bit,i)
	x=pow(x,k)
	goodcnt=[0]*(len(a))
	cmax=get_or(bit)
	cind=0
	cnt1=0
	for num in range(len(a)):
		tbit=nbitsub(bit,a[num])
		a[num]*=x
		tbit=bt(tbit,a[num])
		tor=get_or(tbit)
		if tor>cmax:
			cind=num
			cmax=tor
		a[num]//=x
	a[cind]*=x
	# print(a)
	# print(cmax)
	# print(get_or(bit),bit)
	return cmax

n,k,x=map(int,input().strip().split())
a=list(map(int,input().strip().split()))
print(f(a,k,x))