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nightlydreamer

Задание 3

Sep 20th, 2019
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Python 0.09 KB | None | 0 0
  1. n = int(input())
  2. k = 0
  3.  
  4. for i in range(1, n + 1):
  5.     k += i + i - 1
  6.    
  7. print(k)
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