int solution(int N) {
    // write your code in C++14 (g++ 6.2.0)
    int count=0;
    for (int x=0;x<=N;x++)
    {
        for (int y=0; y<=N;y++)
        {
            if(x*x+y*y<=N*N) count++;
        }
    }

    return (4*count-4*N-3);
}