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using nb = int;
using id = std::string;
struct add_tag {};
struct mul_tag {};
template<typename Tag, typename R>
struct op
op() = default;
template<typename Range>
explicit op (Range const& rng) : m_rands(rng.begin(), rng.end()) {}
std::vector<R> const& rands() const { return m_rands; }
std::vector<R> m_rands;
template<typename R> using add_op = op<add_tag, R>;
template<typename R> using mul_op = op<mul_tag, R>;
template<typename R>
using expression_r = boost::variant<int, id, add_op<R>, mul_op<R>>;
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