// c#

public static int beautifulBinaryString(string b)
{       
    string newB = b.Replace("010", "xxx");
    int occur = 0;

    for(int i=0; i<newB.Length; i++)
    {
        if (newB.Substring(i,1) == "x")
        {
            i += 2;
            occur++;
        }
    }

    return occur;
}