#include <iterator>

template<typename T, typename Iterator>
Iterator finds(const T &value, Iterator b, Iterator e, std::bidirectional_iterator_tag) {
    while (b != e) {
        if (*b == value)
            return b;
        else
            b++;
    }
    return e;
}

template<typename T, typename Iterator>
Iterator finds(const T &value, Iterator b, Iterator e, std::random_access_iterator_tag) {
    Iterator l = b, r = e - 1, mid;
    while (l < r) {
        mid = (r - l) / 2 + l;
        if (*mid < value) l = mid + 1;
        else r = mid;
    }
    if (*l == value)
        return l;
    return e;
}

template<typename T, typename Iterator>
Iterator Find(const T &value, Iterator first, Iterator last) {
    return finds(value, first, last,
                 typename std::iterator_traits<Iterator>::iterator_category());
}