

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 cnt=0;
		for(int i=a;i<b+1;i++)
		{
			if(c%i==0)
				cnt++;
		}
		
		System.out.println(cnt);
	}
}

