using System;

public class Program

{

    public static void Main()

    {

    int[] array = {1,0,0,1,1,1,1,0,0,1,1,0,1};

    int count =0;

        //  Console.Write(array[0]);

          for(int K=1; K<array.Length;K++)

          {

              if(array[K]==1){

             if(array[K]==array[K-1])

             {

                 count++;

             }

              }

        }

          Console.WriteLine(count);

    }

​

}