month = int(input()) def tuzi(month): new_num1 = 1 new_num2 = 0 old_num = 0 for i in range(month-1): old_num += new_num2 new_num2 = 0 new_num2 += new_num1 new_num1 = 0 new_num1 += old_num total_num = new_num1 + new_num2 + old_num return total_num print(tuzi(month))
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