
public class Main {
	public static void main(String args[]) {

		java.util.Scanner sc = new java.util.Scanner(System.in);
		long N = sc.nextLong();

		long A = 0;
		long B = 0;
		for (long i = (long) Math.sqrt(N); i > 0; i--) {
			if (N % i == 0) {
				A = i;
				B = N / i;
				break;
			}
		}

		System.out.println(A + B - 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