import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        long n = sc.nextLong();
        long max = (long) Math.ceil(Math.sqrt(n));
        for (long i = max; i >= 1; i--) {
            if (n % i == 0) {
                long x = n / i;
                System.out.println((i - 1) + (x - 1));
                return;
            }
        }
    }
}

/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