n = Integer(STDIN.gets.chomp)
next_pattern = (0...n).map{|x| 1 << x}
pattern = {}
(0...n).map{|x| 1 << x}.each do |x|
    next_pattern.each do |y|
        if x & y == 0
            pattern[[x, y, x | y]] = 1
        end
    end
end
(3..n).each do
    new_pattern = {}
    new_pattern.default = 0
    pattern.each do |k, v|
        next_pattern.each do |x|
            if k[2] & x == 0 && k[0] & (x << 1 | x >> 1) == 0
                y = [k[1], x, k[2] | x]
                new_pattern[y] = new_pattern[y] + v
            end
        end
    end
    pattern = new_pattern
end
puts pattern.each_value.sum