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: Time Limit Exceeded)

using System;
using System.Linq;
 
public class Program {
	public static void Main() {
		Console.ReadLine();
 
		var numbers = Console.ReadLine().Split(' ')
			.Select(x => ulong.Parse(x))
			.ToArray();
		ulong divisor = (ulong)Math.Pow(10, 9) + 7; 

		ulong result = 0;
		for(int i = 0; i < numbers.Length - 1; i++) {
			ulong temp = 0;
			for(int j = i + 1; j < numbers.Length; j++) {
				ulong value = numbers[i] ^ numbers[j];

				if(temp > ulong.MaxValue - value) {
					temp %= divisor;
				}
				temp += value;
			}

			if(result > ulong.MaxValue - temp) {
				result %= divisor;
			}
			result += temp;
		}
 
		Console.WriteLine(result % divisor);
	}
}