import java.util.Scanner;

class Main {

	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		
		int a = scanner.nextInt();
		int b = scanner.nextInt();
		int c = scanner.nextInt();
		
		int n = 0;
		
		for (int i = a; i <= b; i++) {
			if (c % i == 0)
				n++;
		}

		System.out.println(n);
	}

}

