import java.util.*;
import java.util.stream.*;

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();
        System.out.println(IntStream.range(a, b).filter(i -> c % i == 0).count());
    }
}