import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		long goal = sc.nextLong();
        long num1 = 1;
        long num2 = goal;
      
      	for(int i = 1; i <= goal/i; i++){
        	if(goal % i == 0){
            	num1 = i;
                num2 = goal / i;
            }
		}
        System.out.println(num1 + num2 - 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