#include <bits/stdc++.h>
using namespace std;

struct iofast_t {
    iofast_t() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} iofast;

struct uns_t {} uns;
template <typename Element, typename Head, typename ...Args>
auto vec(Element init, Head arg, Args ...args) {
    if constexpr (sizeof...(Args) == 0) return std::vector(arg, init);
    else return std::vector(arg, vec(init, args...));
}
template <typename Element, typename Head, typename ...Args>
auto vec(uns_t, Head arg, Args ...args) {
    return vec(Element(), arg, args...);
}

template <typename T, typename Compare = less<T>>
T &chmin(T &l, T r, Compare &&f = less<T>()) { return l = min(l, r, f); }
template <typename T, typename Compare = less<T>>
T &chmax(T &l, T r, Compare &&f = less<T>()) { return l = max(l, r, f); }

int main() {
    int64_t n; cin >> n;

    int64_t ans = n;
    for (int64_t i = 2; i * i * i <= n; ++i) {
        int64_t v = 1;
        for (int j = 1; v <= n / i; ++j) {
            v *= i;
            chmin(ans, i + j + (n - v));
        }
    }

    int64_t l = 1, r = n + 1;
    while (1 < r - l) {
        __int128_t m = l + (r - l) / 2;

        if (m * m <= n) {
            l = m;
        }
        else {
            r = m;
        }
    }
    chmin(ans, l + 2 + (n - l * l));

    cout << ans << endl;
}