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Time Limit: 3 s
Memory Limit: 128 MB
Total points: 100
#12619. Invitation
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English (Petrozavodsk Camp)
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The problem was used in the following contests:
Petrozavodsk Summer 2017. Day 9. JOI TST 2012 Selection
The 11th Japanese Olympiad in Informatics Spring Training Camp (JOISC 2011/2012) Day 4
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