static void Main()
{
var ss = new StreamScanner(new StreamReader(Console.OpenStandardInput()));
var sw = new StreamWriter(Console.OpenStandardOutput())
{
AutoFlush = false
};
new Program().Solve(ss, sw);
sw.Flush();
}
void Solve(StreamScanner ss, StreamWriter sw)
{
//---------------------------------
var N = ss.Next(int.Parse);
var K = ss.Next(long.Parse);
var A = ss.Next(long.Parse, N);
var memo = new long[50, 2];
for (var i = 0; i < 50; i++)
{
memo[i, 0] = long.MinValue;
memo[i, 1] = long.MinValue;
}
Func <int, bool, long> DFS = null;
DFS = (digit, fever) =>
{
if (digit == -1)
{
return(0);
}
if (memo[digit, fever ? 1 : 0] != long.MinValue)
{
return(memo[digit, fever ? 1 : 0]);
}
var place = 1L << digit;
var popCount = A.Sum(a => (a >> digit) & 1);
Func <bool, long> f0 = b => popCount * place + DFS(digit - 1, b);
Func <bool, long> f1 = b => (N - popCount) * place + DFS(digit - 1, b);
if (fever)
{
return(memo[digit, 1] = Math.Max(f0(true), f1(true)));
}
if (((K >> digit) & 1) == 1)
{
return(memo[digit, 0] = Math.Max(f0(true), f1(false)));
}
return(memo[digit, 0] = f0(false));
};
sw.WriteLine(DFS(40, false));
//---------------------------------
}
void Solve(StreamScanner ss, StreamWriter sw)
{
//---------------------------------
const int MAX = 50;
var N = ss.Next(int.Parse);
var K = ss.Next(long.Parse);
var A = ss.Next(long.Parse, N);
var pops = new long[MAX];
foreach (var a in A)
{
for (var i = 0; i < MAX; i++)
{
if (((a >> i) & 1) == 1)
{
pops[i]++;
}
}
}
var memo = new long[MAX];
for (var i = 0; i < MAX; i++)
{
var place = 1L << i;
memo[i] += Math.Max(N - pops[i], pops[i]) * place;
if (i > 0)
{
memo[i] += memo[i - 1];
}
}
var ans = 0L;
var current = 0L;
var kBase2 = Convert.ToString(K, 2);
var kBase2Rev = (new string('0', MAX - kBase2.Length) + kBase2).Select(c => c - '0').Reverse().ToArray();
for (var i = MAX - 1; i >= 0; i--)
{
var place = 1L << i;
if (kBase2Rev[i] == 0)
{
current += pops[i] * place;
}
else
{
if (i > 0)
{
ans = Math.Max(ans, current + pops[i] * place + memo[i - 1]);
}
current += (N - pops[i]) * place;
}
}
ans = Math.Max(ans, current);
sw.WriteLine(ans);
//---------------------------------
}