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prev_two = 1;
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prev_one = 0;
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fib_num = 0
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sum = 0
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while True:
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if fib_num > 4000000:
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break
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fib_num = prev_one + prev_two
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if fib_num % 2 == 0:
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sum += fib_num
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prev_two = prev_one
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prev_one = fib_num
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print(sum)
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