static boolean findPattern(int index, String b){
    int n = b.length();
    return (index < n - 2 && b.substring(index, index + 3).equals("010") );
    }
 
  public static int beautifulBinaryString(String b) {
    int count = 0;
    int n = b.length();
    int i = 0;
    while(i < n){
      if(findPattern(i, b)){
        count++;
        i += 3;
        }
      else
        i++;
       
      }
    return count;
    }