#include<bits/stdc++.h>
using namespace std;
int main(){
  long long N;
  cin>>N;
  long long ans=N;
  for(long long i=2;i*i*i<=N;i++){
    long long t=1,cnt=0;
    while(N/t>=i){
      t*=i;
      cnt++;
    }
    ans=min(ans,i+cnt+N-t);
  }
  ans=min(ans,(long long)(sqrt(N))+2+N-(long long)(sqrt(N))*(long long)(sqrt(N)));
  cout<<ans<<'\n';
}