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 x = a; x <= b; x++) {
			if (c % x == 0) {
				count++;
			}

		}
		System.out.println(count);
	}

}

