static int bfs(int i,int j,int k ,int count)
     {


        node node = new node(i,j,k,count);
        node.d= 0; //distance to the source node is initialized to zero
        Queue<node> q = new LinkedList<node>();
        q.add(node); //add the first node to the queue

         while(!q.isEmpty()){
                 node u = q.poll();
                 for(int v = 0 ; v < 6 ; v++)
                 { //check all the neighbours of u, if one of them is not visited, add it to the queue and mark it as visited


                    int xx = u.x + dx[v];
                    int yy = u.y + dy[v];
                    int zz = u.z + dz[v];


                    if(xx >= 0 && xx < l && yy >= 0 && yy < r && zz >= 0 && zz < c && !visited[xx][yy][zz] && maze[xx][yy][zz] != '#')
                    {

                        visited[xx][yy][zz] = true;

                        node newNode= new node(xx,yy,zz,u.d+1);
                             //v is not visited yet

                        q.add(newNode);

                            if(eX == xx && eY == yy && eZ == zz)
                            {
                                flag = true;
                                return count;
                            }
                    }
                }
         }
        return count;
     }