#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  int ans = N;
  int l = 0,r = 1e9+1;
  while(r-l > 1){
    int mid = (l+r)/2;
    if(mid*mid > N) r = mid;
    else l = mid;
  }
  ans = min(ans,2+l+(N-l*l));
  int ll = 0,rr = 1e6+1;
  while(rr-ll > 1){
    int mid = (ll+rr)/2;
    if(mid*mid*mid > N) rr = mid;
    else ll = mid;
  }
  ans = min(ans,3+ll+(N-ll*ll*ll));
  for(int i=2;i*i*i*i<=N;i++){
    int now = 1;
    int count = 0;
    while(8*1e18/i >= now && now*i <= N){
      now *= i;
      count++;
      ans = min(ans,i+count+N-now);
    }
  }
  cout<<ans<<endl;
}