

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);

		long n = sc.nextLong();

		long minSteps = Long.MAX_VALUE;
		for(int i = 1; i <= Math.sqrt(n); i++){
			if(n%i != 0){
				continue;
			}

			long tmp = n/i + i - 2;

			if(minSteps > tmp){
				minSteps = tmp;
			}
		}

		System.out.println(minSteps);
	}

}

/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