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 divisorNum = 0;
		for (int i = a; i <= b; i++) {
			if (c % i == 0)
				divisorNum++;
		}

		System.out.println(divisorNum);
	}

}