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  1. pi = 3.14
  2.  
  3. t = int(input())
  4.  
  5. if t == 1:
  6. a = int(input())
  7. b = int(input())
  8. print(a * b)
  9. elif t == 2:
  10. a = int(input())
  11. h = int(input())
  12. print(a * h / 2)
  13. elif t == 3:
  14. r = int(input())
  15. print(pi * r * r)
  16.  
Success #stdin #stdout 0.01s 7244KB
stdin
1
4
7
stdout
28