import java.util.*;
public class Main{
   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);

      long n = sc.nextLong();

      long m = (long)Math.sqrt(n);

      long c = n+2;

      for (long i = 1; i < m+1; i++) {
         if (n % i == 0) {
            if(i + n/i < c){
               c = i + n/i;
            }
         }
      }
      System.out.println(c-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