import java.util.*;

/**
 * Main
 */
public class Main {
  Scanner sc;

  public static void main(String[] args) {
    (new Main()).run();
  }

  public void run() {
    this.sc = new Scanner(System.in);
    long n = sc.nextLong();
    long sq = (long) (Math.floor(Math.sqrt(n)));
    long one = sq;
    long pair = -1;
    for (; one > 0; one--) {
      if (n % one == 0) {
        pair = n / one;
        break;
      }
    }
    System.out.println(one + pair - 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