def ottd_display_speed(value, divisor, unit):
    return int(value.value / divisor) * 10 // 16 * unit.ottd_mul >> unit.ottd_shift

->

def ottd_display_speed(value, divisor, unit):
    return int(value.value / divisor * 10 / 16 * unit.ottd_mul) >> unit.ottd_shift