#include <bits/stdc++.h>

using i32 = std::int32_t;
using u32 = std::uint32_t;
using i64 = std::int64_t;
using u64 = std::uint64_t;
using i128 = __int128_t;
using u128 = __uint128_t;
using isize = std::ptrdiff_t;
using usize = std::size_t;

class rep {
    struct Iter {
        usize itr;
        constexpr Iter(const usize pos) noexcept : itr(pos) {}
        constexpr void operator++() noexcept { ++itr; }
        constexpr bool operator!=(const Iter& other) const noexcept { return itr != other.itr; }
        constexpr usize operator*() const noexcept { return itr; }
    };
    const Iter first, last;

  public:
    explicit constexpr rep(const usize first, const usize last) noexcept : first(first), last(std::max(first, last)) {}
    constexpr Iter begin() const noexcept { return first; }
    constexpr Iter end() const noexcept { return last; }
};

template <class T> using Vec = std::vector<T>;

void main_() {
    u64 N;
    std::cin >> N;
    u64 ans = N;
    for (const auto e : rep(2, 60)) {
        u64 ok = 1, ng = N + 1;
        while (ng - ok > 1) {
            const auto md = (ok + ng) / 2;
            u64 cur = 1;
            bool f = true;
            for (const auto k : rep(0, e)) {
                if (cur > N / md) {
                    f = false;
                    break;
                } else {
                    cur *= md;
                }
            }
            (f ? ok : ng) = md;
        }
        u64 cur = 1;
        for (const auto k : rep(0, e)) {
            cur *= ok;
        }
        ans = std::min(ans, ok + e + (N - cur));
    }
    std::cout << ans << '\n';
}

int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    main_();
    return 0;
}