N=int(input())
P=998244353
def m(x,y):
	return[(x[0]*y[0]+5*x[1]*y[1])%P,(x[0]*y[1]+x[1]*y[0])%P]
def p(x,n):
	a=[1,0]
	q=x
	while n:
		if n&1:a=m(a,q)
		n,q=n>>1,m(q,q)
	return a
h=(P+1)//2
print((p([h,h],N)[1]-p([h,-h],N)[1])%P)