import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		//Start of Main Method
			int startNumber = sc.nextInt();
			int endNumber = sc.nextInt();
			int divisor = sc.nextInt();

			int lastlyDivisor = 0;
			for(int i = startNumber; endNumber > i;i++) {

				if(divisor % i == 0) {
					lastlyDivisor++;
				}

			}

			System.out.println(lastlyDivisor);


		//End of Main Method
		}

	//End of Main class
}
