import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		long n = sc.nextLong();
		long num = 0;
		for (long i=1; i<Math.sqrt(n); i++) {
			if (n%i==0) {num++;}
		}
		System.out.println(num*2);
	}
}