A given government spends $200 million to build a better highway system without changing taxes. Experts estimate that the value of the highway system is $150 million. If we calculate government debt in the standard way, we would say this project added $_______ million in government debt, all else equal. (We'll reuse this information again in the next question. Note that your answer is given in millions, so if your answer is $99 million, enter just 99 in the blank.)