#include <type_traits>
#include <iostream>


template<size_t i>
struct best_type {
    typedef typename std::conditional<
        (i <= 8),
        uint8_t,
        typename std::conditional<
            (i <= 16),
            uint16_t,
            typename std::conditional<
                (i <= 32),
                uint32_t,
                uint64_t
            >::type
        >::type
    >::type type;
};
    

int main() {
    std::cout << sizeof(best_type<2>::type) << std::endl;
    std::cout << sizeof(best_type<8>::type) << std::endl;
    std::cout << sizeof(best_type<15>::type) << std::endl;
    std::cout << sizeof(best_type<17>::type) << std::endl;
}