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 cnt = 0;
		
		for (; a <= b; a++)
			if (c % a == 0) cnt++;
		
		System.out.println(cnt);
		
		sc.close();
	}

}