import java.util.*;

public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		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);
	}
}