小慕负责筹备一场大型文艺汇演，园区内同时有多场演出在进行。由于每场演出都只能完整观看，不能中途入场或提前离场，而且小慕一次只能观看一场演出。此外，不同演出分布在园区的不同场地，因此连续两场观看之间至少需要留出 15 分钟的时间用于转场。 小慕是个狂热的文艺爱好者，希望能尽可能多地观看演出。 现在给定演出的时间安排表，请你帮小慕计算出他最多能观看多少场演出。
提示：带虚线的词点一下有通俗解释。
输入描述
<div data-page-id="WyahdwqCLoz0TNxY0Fmc8PUVnSg" data-docx-has-block-data="false"> <div style="white-space-collapse:preserve;" class="ace-line ace-line old-record-id-DzdkdAfLYonVIUxIYkAcWTUHnRh"> 第一行为一个数 <code>N</code>，表示演出场数，<code>1 <= N <= 1000</code>。 </div> <div style="white-space-collapse:preserve;" class="ace-line ace-line old-record-id-Vf62dc38jok8PtxOdsxc1zGFnIe"> 接下来 <code>N</code> 行，每行两个空格分割的整数，第一个整数 <code>T</code> 表示演出的开始时间，第二个整数 <code>L</code> 表示演出的持续时间，<code>T</code> 和 <code>L</code> 的单位为分钟，<code>0 <= T <= 1440, 0 < L <= 100</code>。 </div> </div> <span 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表示演出的开始时间，第二个整数 L 表示演出的结束时间，T 和 L 的单位为分钟，0 <= T <= 1440, 0 < L <= 100。"},"attribs":{"0":"*0+4*0*1+1*0+l*0*1+1*0+h*0*1+1*0+b*0*1+1*0+3*0*1+1*0+8*0*1+s*0+1"}},"apool":{"numToAttrib":{"0":["author","7115054903550050305"],"1":["inlineCode","true"]},"nextNum":2}},"align":"","folded":false}},"WyahdwqCLoz0TNxY0Fmc8PUVnSg":{"id":"WyahdwqCLoz0TNxY0Fmc8PUVnSg","snapshot":{"type":"page","parent_id":"","comments":[],"locked":false,"hidden":false,"author":"7115054903550050305","children":["doxcnwSnjjvJWvNQ84L4FO21tld","VYObd3eJ2oh6aZxQpEkcapiwnEg","FU9Udeb5to73FDxcGdhcU3ACnNh","DzdkdAfLYonVIUxIYkAcWTUHnRh","Vf62dc38jok8PtxOdsxc1zGFnIe","TVN8dLDBioC0JXxWe1CcsJdXnVH","ZvjKdHzj7o2yiPxK6otcRwtbn0b","CyCQd59zYokQgyxfXZjcm7stn7f","YKPEdfqsko4uf1xTaQLcAF2Cnfg","HOk0ddvp5o4iMExIuJncbqP4nsO","KUMZdLVGlo0npex4wHAcod7Hnoe","Iz0XdG4AAoaUvnxJwyecf1xanhb","Gw9ldUs7LoGNMMx6WaAcAA1Mn9b","BYgedP5KIoD7lyxMDtGcQ66DngY","X1r1dvrRPosSs5xWBj3c4rcdncg","VODxdvqryoq1Ezxipp8cV3Ltnyh","BMsvdkq0ioJbSGxHZZkcFL6znId","XVNHdERrKo5IjAxgFzbcEMfgn1g","LKYMdmLAFoMBEYxCaovcO0UQnAf","Mgsod6OO0oLKiNxM5TdcvsQfnKf","HeKSdw5YUowa0Dxjhr5cEIEZnOc","IvhLdfPa8o3n1TxVsDyc58FZnge","DL5DdWuOtou7PcxoNg6cmKrlnog","DL9udV6VSoysvaxtJSccCnxdn9Q","KaBzdLkSjozHSsx1nftcdGnOnhT","Fyefd9mNNorJcZxf9QzcQiQCnlf","MWrGdYifsoQRHjxPuX1cDca1n0g","JoCLdqZYZoOheqxFBYsc00T6nxf","OpeWdDFTYoGWkaxYlFScK8benFg","doxcnABE0zcsAdaA66JTQ2hMKwh","doxcnZVw9g1ZiLJLjiDALPyuA2Q","VgfYdoNO5oy2r6xU5blc0Ds5nih","OMGodMmNSo03b0x8KNfc8Yqmnob","doxcnS0DzPA38pk4rv4CgQuruOd","JEGdd1ERhoAIC9xIsfkchMvhnEd","TStmdWTPwotsDqxZuQMcFFrGnTc","AtH3dXu4koSQ29xf81RcVtk5nEf","ZFrTdmoqxorUNMxljTwcFM8En4e","ZoMCdlLY7o6fwpxtOHycSVXanOf","HKg6d2mmLoa065xvJSEceBaanOe","WHoedU2FHoyQMRx0D7ycB1ELnzh","NAlMdQs4AoIfsqxjavIcYBx5n9d","GpoWdTeyBo9HgaxXwP7c8B7BnTb","EJqYdCvv8ovHnyx7kZ1cmhDtn6d","L6opd8nmKoxF3ExzBcOc6Jc8nfc","L3BfdZQB3oR9nrxWNmJcvwo4nWh","MVLXd91IYochw1xE08lcmckGnvh","LAcZd8c48oDAYyxCmXTcH850nMe","P8w8dFVBZoxIPIxDaoicOfv6nFf","HSFPdt4uOoEs85xbcwbcrCKgniu","M4xXdwatModuKtx7OtHcVLG9ngl","LLGBdXTCCoAqCtxBb0AcFCIWn4g","J3Fgdsj6xoRREJxpBr6cz9A5n5c","OJK8dxH7PoigOdxuIJPcbe5lnhg","XRj5dd82aog1LHxTehOciDWRnoh","IidddrfpboBf7rxXKnUcfaXJnRI","Nf0WdOygRouNlixbV19cJlkjnjh","NYzPdQuFYoPr9Ix2bOjc9qMsnDb","CP4vdqzh2ogonkxI5KNcwZP1n1d","YLf9dExIhohbK9xSkepcgI84nSg","C0JkdZZbuoRgNtxMJDtcXecAn9d","NRZxdH3JNo9MsXxq2Q9cNW1Snlg","HMKadWGCDoOprZxa3sjcqbiFnfg","ZEMId5jQZoGO7nxI5U7coJQ1n1c","VlfNdldOeoktutxsIUEc2ijPnrv","RREzd1IBboGOkQxYzDocHDFInSd","K81PdXWoxoEQYPxvqOucB5fZnOC","HWQ9dPqI3oZ5mMxZcXOc1hN3nWg","NFicdkwaCoNxyhx7oYwcRol0nUd","LeF2dAgJaoZWndxasPzciXCBn1c","TE57dL4ejopsWSxLBs0c0DSRnsc","JQzOdCehvo2EMmxJLkTc0KoWnHd","Dim1drrutokFdqxciTWcZoZOnRb","NEomdel8woQYd1xPhB2chIlSnde","Z5SLdfjqxo6s7Cxpgt4cQ0kInpc","doxcnA30aNa1EpDYnUkAh6HVndg","GkE8dju1qoSIRqxvOwbcyXVPnBg","doxcnjLZEKC39p9PATNZWF1X35f","doxcn1Zj5ukqNEOv8rr69dkJ5Gh","doxcnDENaHmJI7qyYXE5tKcSPwf","doxcnxq3hSC3QoxHsjgmo5qYeHh","ZsemdNRVyozN5dx3vVBc92DRnHd","ItHwdhsx8ofCAXxqTvMczjLOnah","XmZmdoGyOok0TVxXuanc5wSUnqc","HmW2dXdhjooLMxxDXd7ce8PMncg","UvWxdQoHVoCvEDxIvbncT1DknRd","DUTPdMyknoaHWYx2fbEcUmgNnbh"],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7115054903550050305"],"1":["abbreviation-data","{\"id\":\"1fd3c826-6be1-44d5-85c8-2407a183d57d\",\"abbr_ids\":\"enterprise_7221066159129608193\",\"is_visible\":1,\"is_first\":1}"]}},"initialAttributedTexts":{"attribs":{"0":"*0+1*1*0+2*0+g"},"text":{"0":"【DP/贪心】2023B-观看文艺汇演"}}},"align":"","doc_info":{"editors":["7115054903550050305"],"options":["editors","create_time"],"deleted_editors":null}}}},"payloadMap":{"DzdkdAfLYonVIUxIYkAcWTUHnRh":{"level":1},"Vf62dc38jok8PtxOdsxc1zGFnIe":{"level":1}},"extra":{"mention_page_title":{},"external_mention_url":{}},"isKeepQuoteContainer":false,"selection":[{"id":5,"type":"text","selection":{"start":0,"end":32},"recordId":"DzdkdAfLYonVIUxIYkAcWTUHnRh"},{"id":6,"type":"text","selection":{"start":0,"end":98},"recordId":"Vf62dc38jok8PtxOdsxc1zGFnIe"}],"pasteFlag":"9ea62233-7fdb-4e62-b783-c009066c712d"}" 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输出描述
<div data-page-id="WyahdwqCLoz0TNxY0Fmc8PUVnSg" data-docx-has-block-data="false"> <div style="white-space-collapse:preserve;" class="ace-line ace-line old-record-id-ZvjKdHzj7o2yiPxK6otcRwtbn0b"> 最多能观看的演出场数。 </div> </div> <span data-lark-record-data="{"rootId":"WyahdwqCLoz0TNxY0Fmc8PUVnSg","text":{"initialAttributedTexts":{"text":{"0":"最多能观看的演出场数。"},"attribs":{"0":"*0+b"}},"apool":{"numToAttrib":{"0":["author","7115054903550050305"]},"nextNum":1}},"type":"text","referenceRecordMap":{},"extra":{"mention_page_title":{},"external_mention_url":{}},"isKeepQuoteContainer":false,"isFromCode":false,"selection":[{"id":8,"type":"text","selection":{"start":0,"end":11},"recordId":"ZvjKdHzj7o2yiPxK6otcRwtbn0b"}],"payloadMap":{},"isCut":false}" data-lark-record-format="docx/text" class="lark-record-clipboard"></span>
示例
示例 1
输入
2 720 120 840 120
输出
1
说明：第一场演出开始时间是第720分钟，经过120分钟演出结束，即第840分钟结束，此时还需要15分钟的间隔时间，即要等到第855分钟才可以看下一场演出，故来不及看第二场在第840分钟开始的演出。最多只能看1场演出。
示例 2
输入
2 20 60 100 60
输出
2
说明：第一场演出开始时间是第20分钟，经过60分钟演出结束，即第80分钟结束，此时还需要15分钟的间隔时间，即要等到第95分钟才可以看下一场演出，第二场演出在第100分钟开始的演出，赶得上观看第二场演出。最多可以观看2场演出。
示例 3
输入
4 10 20 100 20 150 60 80 40
输出
3
时间限制 1000 ms · 内存限制 128 MB