乔治和朋友亚历克斯进入BSUCP大学，并希望住在同一间宿舍。宿舍共有n个房间，每个房间已住人数pi和最大容纳人数qi。任务是找出能同时容纳两人的房间数量。输入包含房间数n及各房间信息，输出符合条件的房间数。
George and Accommodation
George has recently entered the BSUCP (Berland State University for Cool Programmers). George has a friend Alex who has also entered the university. Now they are moving into a dormitory.
George and Alex want to live in the same room. The dormitory has n n n rooms in total. At the moment the i i i-th room has p p pi people living in it and the room can accommodate q q qi people in total ( p p pi ≤
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