class Wall{
  int x,y;
   Wall(int px,int py){
      x = px;
     y = py; 
   }
   void draw(){
      fill(80,100);
     rect(x*SQUARESIZE,y*SQUARESIZE, SQUARESIZE,SQUARESIZE);
   }
}

boolean wallThere(int x, int y){
  for(Wall w : walls){
    if(w.x == x && w.y == y) return true;
  }  
  return false;
}