import java.util.*;
import java.math.*;
public class Main{
  public static void main(String[] args)
  {
    Scanner s=new Scanner(System.in);
    long  n=s.nextLong();
    long ans=0;
    int i=(int)Math.sqrt(n);
    for(;i>=1;i--)
    {
       if(n%i==0)
       {
         ans=i+n/i-2;
       System.out.println(ans);
       break;
       }
    }
      }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz