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