N, X, Y = map(int, input().split())
if Y < X:
	X, Y = Y, X
mod = 998244353
if Y - X == 1:
	if X != 1 and Y != N:
		print(0)
		exit()
if X != 1:
	X += 1
if Y != N:
	Y -= 1

L = Y-X + 1
# print('L',L)
if L <= 2:
	print(1)
	exit()
dp = [1 for _ in range(L)]
for l in range(3, L):
	# print(l)
	dp[l] = (dp[l-3] + dp[l-1])%mod
print(dp[L-1])