#include <bits/stdc++.h>
typedef long long ll;
const int maxn = 1e18;

ll qmi(ll a, ll k)
{
  ll res = 1;
  while (k)
  {
    if (k & 1) res = (ll)res * a;
    k >>= 1; a = (ll)a * a;
  }return res;
}

int main()
{
  ll n; scanf("%lld", &n);
  if (n <= 4) {std::cout << n << "\n"; return 0;}
  ll ans = 1e18;
  
  for (ll j = 2; j <= 60; j ++)
  {
    ll i = qmi(n, 1.0 / j);
    while (qmi(i + 1, j) <= n) i ++;
    ll k = n - qmi(i, j);
    ans = std::min(ans, i + j + k);
  }
  
  std::cout << ans << "\n";
  
  return 0;
}