n, x = gets.split.map(&:to_i)
a = gets.split.map(&:to_i)
count = 0
(0...n).each do |i|
    (i...n).each do |j|
        if a[i]+a[j]==x
            count += 1
            if i!=j
                count += 1
            end
        end
    end
end
puts count