n, x, y = map(int,input().split())
if x > y:
	x, y = y, x

t = x + 1
if x == 1:
	t = 1

u = y - 1
if y == n:
	u = y

mod = 998244353

if t > u:
	print(0)
else:
	targ = u - t
	a = [0, 1, 1]
	for i in range(targ):
		a.append((a[-1] + a[-3]) % mod)
	print(a[targ+1])