import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int count = 0;
		for (int i = a; i < b; i++) {

			if (c % i == 0) {
				count++;
			}

		}

		System.out.println(count);

		sc.close();

	}

}
