import java.io.*;
import java.util.*;

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; i++) {
	    if (c % i == 0) {
		cnt++;
	    }
	}

	System.out.println(cnt);
    }
}