import java.io.*;
import java.util.*;
 
public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		PrintWriter out = new PrintWriter(System.out);
		
		long n = in.nextLong();
		long q = 0;
		for (int m = 1; m <= n; m++)
			if (n / m == n % m)
				q += 1;
		out.print(q);
		
		out.flush();
	}
}