def remove_Char(s,c) :
      
    counts = s.count(c) 
    s = list(s) 
    while counts :  
        s.remove(c) 
        counts -= 1 
    s = '' . join(s)   
    return (s) 
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] 