def task_7_5():
    move_right()
    fill_cell()
    m=1
    n=0
    while not wall_is_on_the_right():
        for i in range(m):
            if not wall_is_on_the_right():
                move_right()
                n+=1
                if n==m:
                    fill_cell()
                    n=0
        m+=1