import java.util.Scanner;

class Main
{
  public static void main(String[] args) {
    int a, b, c, count=0;
    Scanner sc = new Scanner(System.in);
    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);
  }
}