import java.util.*;
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 count = 0;
    for(int i = a; i<b+1; i++){
      if(c % i == 0){
        count++;
      }
    }
    System.out.println(count);
  }
}