res = []
max = gets.chomp.to_i
(1..max).each do |i|
    (1..max).each do |j|
        if i * j == max and not res.include?([i,j].sort)
            res << [i,j].sort.uniq
        end
    end
end
result = 0
res.each do |a|
    result += a.length
end

puts result