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- n = int(input())
- b = []
- for i in range(n):
- b.append(int(input()))
- b.sort(reverse = True)
- number_of_groups = n // 3
- i = 2
- discount = 0
- for j in range(number_of_groups):
- discount += b[i]
- i += 3
- print(sum(b) - discount)
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