import java.util.Scanner;
public class Main {
	public static void main(String []args) {
		Scanner sc=new Scanner(System.in);
		long a;
		while(sc.hasNextLong()) {
			a=sc.nextLong();
		double m=Math.sqrt(a);
		long n;
		n=(long)m;
		for(long i=n;i>0;i--) {
			if(a%i==0) {
				System.out.println(i+a/i-2);
				break;
			}
		}
		}	
	}
}
/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