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  1. i = int(input())
  2. count = int(0)
  3. sum = int(0)
  4.  
  5. while count < i:
  6. sum = sum + count
  7. count = count +1
  8.  
  9. print(sum)
Success #stdin #stdout 0.94s 5864KB
stdin
1353752
stdout
916321561876