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#include <iostream>

using namespace std;

int getLitBits(unsigned long long n)
{
    unsigned long long result = 0;
    while (n != 0)
    {
        if (n % 2 == 1)
            ++result;
        n /= 2;
    }

    return result;
}

int main()
{
    int seconds;
    unsigned long long maxBit, currentResult = 0, result = 0;

    cin >> seconds >> maxBit;

    long long * secondsQuality = new long long[seconds];

    for (int i = 0; i < seconds; ++i)
    {
        cin >> secondsQuality[i];
    }

    for (int j = 0; j < maxBit + 2 - seconds; ++j)
    {
        currentResult = 0;
        for (int i = 0; i < seconds; ++i)
        {
            currentResult += secondsQuality[i] * getLitBits(j + i);
        }
        if (currentResult > result)
            result = currentResult;
    }


    cout << result << endl;

    delete [] secondsQuality;
}