class Pattern
{
  private int img[];
  private int width;
  private int height;

  
  public Pattern(int img[],int width,int height)
    {
      this.img  = new int[width*height];
      this.width  = width ;
      this.height = height ;
      for(int i=0;i < width*height;i++)
        {
          this.img[i] = img[i];
        }
      
      }
  
  public int index(int x,int y)
    {
      if( 0 <= x && x<width&&
          0 <= y && x<height
          )
        {
          return img[width*y+x];
        }
      else
        {
          throw new ArithmeticException();
         // return 0;
        }
    }
  
 
  public int searchEdge()
    {
      int sum=0;
      int edge_sum=0;
      System.out.println("pat");
      for(int y= 0; y< height;y++)
        for(int x = 0;x <width;x++)
          {
                            
            if(index(x,y) >0)
              {try{
                sum = 0;
                
                if(index(x,y+1) > 0){sum++;}
                
                if(index(x+1,y+1) > 0){sum++;}
                if(index(x+1,y) > 0){sum++;}
                if(index(x+1,y-1) > 0){sum++;}
                
                if(index(x-1,y-1) > 0){sum++;}
                if(index(x-1,y) > 0){sum++;}
                if(index(x-1,y+1) > 0){sum++;}
                
                if(index(x,y-1) > 0){sum++;}
                
                
                if(sum <= 1)
                  {
                    edge_sum++;
                  }
                
              
              }catch(Exception e){;}}
          }
      return edge_sum;
    } 
}