import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long sumA = 0;
        long sumB = N;
        N=N/2;
        while(N!=0){
            sumA = sumA + N;
            N=N/2;
        }
        System.out.println(sumB-sumA);
    }
}