import java.util.Scanner;

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