mycode/code_study/Baekjoon/java/_9527.java

import java.util.*;

public class _9527 {
    static long[] power2 = new long[55];

    static long getCountOne(long N) {
        long ans = 0;

        for(int i = 54; i>0; i--) {
            long mark = (N & (1L << (i-1)));

            if(mark != 0) {
                ans += power2[i-1] + (N - mark + 1);
                N -= mark;
            }
        }

        return ans;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long A = sc.nextLong();
        long B = sc.nextLong();
        sc.close();

        for(int i=1; i<55; i++) {
            power2[i] = 2*power2[i-1] + (1L << (i-1));
        }

        System.out.println(getCountOne(B) - getCountOne(A-1));
    }
}