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

using ll = long long;

int main(){
  ll n; cin >> n;
  if(n < 4LL){
    cout << n << endl;
  }else{
    ll ans = LLONG_MAX;
    for(ll j = 2; j <= log2(n); j++){
      ll i = pow(n, 1.0 / j);
      ll k = n - pow(i, j);
      ans = min(ans, i + j + k);
    }
    cout << ans << endl;
  }
}