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 num = 0;

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

		System.out.println(num);

	}

}
