import java.util.Scanner;

public class HelloWorld {

	    public static void main(String[] args) throws Exception {
	    		Scanner sc = new Scanner(System.in);
	            int n = sc.nextInt();
	            sc.close();
	            int count = 1;
	            int temp = 1;
	            for (int i=n/2;i>0;i--) {
	            	if (n / i != temp) {
	            		count ++;
	            		temp = n/i;
	            	}
	            }
	            System.out.println(count);
}}