import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); // 注意 hasNext 和 hasNextLine 的区别 int sc = in.nextInt(); long result = 0L; for(int i = 1;i<=sc;i+=2){ result+=i; } for(int i = 2;i<=sc;i+=2){ result+=func(i); } System.out.println(result); } public static int func(int n){ while(n%2==0){ n = n/2; } return n; } }