import java.util.*;
import java.lang.Math;
public class Main{
        public static void main(String[]args){
                Scanner scan = new Scanner(System.in);
                long n = scan.nextLong();
                long t = (long)Math.sqrt((double)n);
                Long x = 0L;
                for(long i = 1; i <= t; i++){
                        if(n % i == 0){
                                x = i;
                                }
                        }
                System.out.println(n / x + x - 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