1. Sum three numbers
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Input
Goal output
Your output
  • 1, 2, 3
    6
    3
  • 0, 0, 0
    0
    0
  • -1, 5, 2
    6
    4
  • 10, -20, 15
    5
    -10
  • 7, 7, 7
    21
    14
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