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