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