import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    
    long n = sc.nextLong();
    
    long ans = 9223372036854775807L;
    
    for(long i = 1; i <= Math.sqrt(n); i++) {
      if(n%i==0) {
        long a = i + (n/i) -2;
        if(a < ans) {
          ans = a;
        }
      }
    }
    
    System.out.println(ans);
  }
}
/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