import java.util.Scanner;

class Main{
    public static void main(String args[]){
        Scanner scan=new Scanner(System.in);
        int a,b,c;
        a=scan.nextInt();
        b=scan.nextInt();
        c=scan.nextInt();
        int count=0;
        for(int i=a;i<=b;i++)if(c%i==0)count++;
        System.out.println(count);
   }
}
