import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		Scanner stdIn = new Scanner(System.in);

		int a = stdIn.nextInt();
		int b = stdIn.nextInt();
		int c = stdIn.nextInt();
		
		int count = 0;
		for (int i = a; i <= b; i++) {
			if (c % i == 0) count++;
		}
		System.out.println(count);
	}
}

