import java.io.*;
import java.util.*;
 class Main
{
public static void main(String arg[])
{
Scanner s=new Scanner(System.in);
long n=s.nextLong();
long count=0,min=Long.MAX_VALUE;
for(int i=1;i<=(int)Math.sqrt(n);i++)
{if(n%i==0)
{count=(i-1)+(n/i)-1;
if(count<min)
min=count;}}
System.out.println(min);}}
/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