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 ans = 0;

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

}

