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 n = a; n <= b; n++) {
            if (c % n == 0) count++;
        }
        System.out.println(count);
    }
}