
import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		Scanner scanner = new Scanner(System.in);	
		int a = scanner.nextInt();
		int b = scanner.nextInt();
		int c = scanner.nextInt();
		
		int cnt=0;
		for(int i=a; i<=b; i++)
		{
			if(c % i == 0)
			{
				cnt++;
			}
		}
		System.out.println(cnt);
	}
}