import std.conv, std.functional, std.range, std.stdio, std.string; import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons; import core.bitop; class EOFException : Throwable { this() { super("EOF"); } } string[] tokens; string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; } int readInt() { return readToken.to!int; } long readLong() { return readToken.to!long; } real readReal() { return readToken.to!real; } bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } } bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } } int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; } int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); } int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); } /* && <= |& <= &| <= || */ void main() { try { for (; ; ) { const N = readInt(); const T = readLong(); auto A = new long[N]; foreach (i; 0 .. N) { A[i] = readLong(); } auto dp = new long[long][N + 1]; void upd(int i, long key, long val) { dp[i].update(key, { return val; }, (ref long r) { return max(r, val); }); } upd(0, T, 0); foreach (i; 0 .. N) { foreach (key, val; dp[i]) { upd(i + 1, key & A[i], val + (key - (key & A[i]))); upd(i + 1, key | A[i], val + ((key | A[i]) - key)); } } debug { int mx; foreach (i; 0 .. N + 1) { chmax(mx, cast(int)(dp[i].length)); } writeln("mx = ", mx); } const ans = dp[N].values.maxElement; writeln(ans); } } catch (EOFException e) { } }