class Scanner {
    private var stack = [String]()
    private var index = 0
    
    func peek() -> String {
        if stack.count == index {
            stack += readLine()!.split(separator: " ").map{ String($0) }
        }
        return stack[index]
    }
    
    func next() -> String {
        let value = peek()
        index += 1
        return value
    }
    
    func nextInt() -> Int {
        return Int(next())!
    }
    
    func nextDouble() -> Double {
        return Double(next())!
    }
}

extension String {
    var characters: [Character] {
        self.map{ $0 }
    }
}

var scanner = Scanner()
let N = scanner.nextInt()
let X = scanner.nextInt()
var A = [Int]()
for _ in 0 ..< N {
    A.append(scanner.nextInt())
}

var counter = [Int: Int]()
var answer = 0
for a in A {
    answer += counter[X ^ a] ?? 0
    counter[a] = (counter[a] ?? 0) + 1
}

print(answer)