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

#ifdef LOCAL
#include "debug.hpp"
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...)
#endif

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);

  ll N; cin >> N;

  // j = 0, j = 1
  ll ans = N;

  // j = 2
  ll temp = max((ll) sqrt(N) - 10ll, 1ll);
  for (ll i = temp; i * i <= N; i++) {
    ll k = N - i * i;
    ans = min(ans, i + 2 + k);
  }

  // j >= 3
  for (ll j = 3; j < 100; j++) {

    ll check = N;
    for (ll jj = 0; jj < j; jj++) {
      check /= 2;
    }
    if (check == 0) break;

    for (ll i = 2; i < N; i++) {
      check = N;
      for (ll jj = 0; jj < j; jj++) {
        check /= i;
      }
      if (check == 0) break;
      ll k = N - pow(i, j);
      if (k < 0) break;
      ans = min(ans, i + j + k);
    }
  }

  cout << ans << '\n';
  return 0;
}