public class Recursif {
    public static double f(double v) {
        if (v == 0) return 0.0;
        if (v == 1) return 1.0;

        return v + f(Math.floor(v / 2)) - f(Math.floor(v / 3));
    }
    
    public static void main(String[] args) {
        System.out.println(f(250));
    }
}