n = int(input())
nums = []
for i in range(n):
num = int(input())
if num % 3 == 0 and (num % 10 == 2 or num % 10 == 4):
nums.append(num)
if len(nums) >= 3:
result = (nums[0] + nums[2]) ** 2
print(result)
else:
print("Опачки!")
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