#include <iostream>
#include <vector>

using namespace std;

int main() {
    int n;
    cin >> n;
    
    vector<int> bitCounts(32, 0); // To store the count of '1's for each bit position.
    for (int i = 0; i < n; ++i) {
        int x;
        cin >> x;
        for (int j = 0; j < 32; ++j) {
            if (x & (1 << j)) {
                bitCounts[j]++;
            }
        }
    }
    
    long long result = 0;
    for (int count : bitCounts) {
        // Combination formula: C(n, 2) = n * (n - 1) / 2
        if (count > 1) {
            result += count * (count - 1) / 2;
        }
    }
    
    cout << result << endl;
    return 0;
}