某列从杭州到温州的火车,包括起始和终点在内共有5个停靠站,小

某列从杭州到温州的火车,包括起始和终点在内共有5个停靠站,小王乘坐这趟列车从杭州到温州,一路上小王在他乘坐的车厢内观测到下列情况:①在起始站(第一站)以后每一站都有车厢内人数(包括小王)的一半人下车;②又有下车人数的一半人上这节车厢;③到第五站(终点站)包括小王在内还有27人。那么起始站上车的人数是             

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