n =: <(<(<':'),<(<(,'0');1),<<;._1 ' 0
".c=.''<('''':'''';<((":0);<1);<(":0);<''''".c=.'''''''''''',((#~[:>:(39{a.)&=)c),39{a.);<<''''?'''''''),<<'?'
   n 5!:0 -: n
1


Ambrus
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