def count_Char(str,x):
     
    count = 0
    for i in range(len(str)):  
        if (str[i] == x) : 
            count += 1
    n = 10
    repititions = n // len(str)  
    count = count * repititions  
    l = n % len(str)  
    for i in range(l): 
        if (str[i] == x):  
            count += 1
    return count  
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] 