import java.util.Scanner;

public class Main {

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

}