import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    long N = sc.nextLong();
    double s = Math.sqrt((double)N);
    long n = (long)s;
    
    int x = 1;
    int y = 1;
    long afterX = 0;
    long afterY = 0;
    
    for(long i=n; i>0; i--){
      if(N % i == 0){
        afterX = i;
        break;
      }
    }
    
    afterY = N / afterX;
    System.out.println((afterX-x) + (afterY-y));
  }
}

/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