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; i++) {
        if (c % i == 0) cnt++;
    }
    System.out.println(cnt);
  }
}
