def month_season(month,days):
 
 if month in ('January', 'February', 'March'):
	 season = 'winter'
 elif month in ('April', 'May', 'June'):
	 season = 'spring'
 elif month in ('July', 'August', 'September'):
	 season = 'summer'
 else:
	 season = 'autumn'
 if (month == 'March') and (days > 19):
	 season = 'spring'
 elif (month == 'June') and (days > 20):
	 season = 'summer'
 elif (month == 'September') and (days > 21):
	 season = 'autumn'
 elif (month == 'October') and (days > 21):
	 season = 'autumn'
 elif (month == 'November') and (days > 21):
	 season = 'autumn'
 elif (month == 'December') and (days > 20):
	 season = 'winter'
 return season
def count_ways(n):
	 
	A = [0] * (n + 1) 
	B = [0] * (n + 1) 
	A[0] = 1
	A[1] = 0
	B[0] = 0
	B[1] = 1
	for i in range(2, n+1): 
		A[i] = A[i - 2] + 2 * B[i - 1] 
		B[i] = A[i - 1] + B[i - 2] 
	return A[n] 