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

		System.out.println(d);
	}
}

