def pajek(moves):
    pos_x, pos_y = 0, 1
    ver_axis = 1
    hor_axis = 1

    cross_count = 0

    for x, y in moves:
        pos_x += x
        pos_y += y

    if pos_x < 0:
        new_ver_axis = -1
    else:
        new_ver_axis = 1

    if pos_y < 0:
        new_hor_axis = -1
    else:
        new_hor_axis = 1

    if ver_axis != new_ver_axis:
        cross_count += 1
        ver_axis = new_ver_axis

    if hor_axis != new_hor_axis:
        cross_count += 1
        hor_axis = new_hor_axis

    return cross_count
print(pajek(([(2, 0), (-1, -2), (1, -1), (-5, 5)])))