import java.util.*;

public class Main {
	public static void main(String[] args) throws Exception{
		Scanner scn = new Scanner(System.in);
		long n = scn.nextLong();
		long i = 1;
       	long j = 1;
      	long a = 1;
      while(a<=n/a){
        if(n%a==0){
          i = a;
          j = n/i;
        }
        a++;
      }
      System.out.println(i+j-2);
	}
}

/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