Problem:
Score : 400 points

Problem Statement

We have N integers. The i-th integer is A_i.

Find \sum_{i=1}^{N-1}\sum_{j=i+1}^{N} (A_i \mbox{ XOR } A_j), modulo (10^9+7).

What is \mbox{ XOR }?

The XOR of integers A and B, A \mbox{ XOR } B, is defined as follows:

When A \mbox{ XOR } B is written in base two, the digit in the 2^k's place (k \geq 0) is 1 if either A or B, but not both, has 1 in the 2^k's place, and 0 otherwise.

For example, 3 \mbox{ XOR } 5 = 6. (In base two: 011 \mbox{ XOR } 101 = 110.)

Constraints

2 \leq N \leq 3 \times 10^5

0 \leq A_i < 2^{60}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1 A_2 ... A_N

Output

Print the value \sum_{i=1}^{N-1}\sum_{j=i+1}^{N} (A_i \mbox{ XOR } A_j), modulo (10^9+7).

Sample Input 1

3
1 2 3

Sample Output 1

6

We have (1\mbox{ XOR } 2)+(1\mbox{ XOR } 3)+(2\mbox{ XOR } 3)=3+2+1=6.

Sample Input 2

10
3 1 4 1 5 9 2 6 5 3

Sample Output 2

237

Sample Input 3

10
3 14 159 2653 58979 323846 2643383 27950288 419716939 9375105820

Sample Output 3

103715602

Print the sum modulo (10^9+7).

Solution in C# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class AtCoderD
{
    private static List<Tuple<int, int>>[] to;
    private static int[] answer;


    static void Main()
    {
        int mod = 1000000007;
        int n = int.Parse(Console.ReadLine());

        long[] a = new long[n];
        {
            var line = Console.ReadLine();
            var words = line.Split(' ');
            for (int i = 0; i < n; i++)
            {
                a[i] = long.Parse(words[i]);
            }
        }

        long answer = 0;
        for (int i = 0; i <= 60; i++)
        {
            int one = 0;
            int zero = 0;
            for (int j = 0; j < n; j++)
            {
                long num = a[j];
                if ((1 & (num >> i)) == 1)
                {
                    one++;
                }
                else
                {
                    zero++;
                }
            }
            answer += (one * zero % mod) * ((long)Math.Pow(2, i) % mod);
            answer = answer % mod;
        }

        Console.WriteLine(answer);
    }
}