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 ans = 0;

    for(int i = a; i <= b; i++){
      if(c % i == 0){
        ans += 1;
      }
    }

    System.out.println(ans);
  }
}

