import java.io.*;
import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long N = Long.parseLong(sc.next());
    
    long n = (long)Math.ceil(Math.sqrt(N));

    for (long i = n; i > 0; i--) {
      if (N % i == 0) {
        System.out.println(i + (N/i) - 2);
        return;
      }
    }
  }
}
/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