#!/usr/bin/env python3

import sys

def xor_count(a, b):
    xor = a ^ b
    i = 0
    while xor != 0:
        i = i + (xor & 1)
        xor = xor >> 1
    return i


def bitwise_difference(A):
    s = 0
    for i in range(len(A)):
        for j in range(i+1,len(A)):
            s = s + xor_count(A[i], A[j])
    return s


if __name__ == "__main__":
    sys.stdin.readline()
    A = sys.stdin.readline().split()
    for i in range(len(A)):
        A[i] = int(A[i])

    print(bitwise_difference(A))