#include <bits/stdc++.h>
//#include<atcoder/all>
using namespace std;
//using namespace atcoder;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<ll>>;


int main() {
    ll N;
    cin >> N;
    ll an = N;
    ll D = sqrt(N);
    an = min(N, N - D * D+D+2);
    for (ll i = 2; i * i*i <= N; i++) {
        ll p = 1;
        ll k = 0;
        while (p <= N / i) {
            p *= i;
            k++;
            an = min(an, k + i + N - p);
        }
    }
    cout << an << endl;
}