n, x, y = map(int, input().split())
if x > y:
    x, y = y, x
if y - x == 1:
    if (x == 1) | (y == n):
        print("{}".format(1))
    else:
        print("{}".format(0))
    exit()

m = y - x - 1
if x == 1:
    m += 1
if y == n:
    m += 1
dp = [0 for i in range(m)]
dp[0] = 1
p = 998244353
for i in range(1,m):
    if i >= 3:
        dp[i] = (dp[i-1] + dp[i-3]) % p
    else:
        dp[i] = dp[i-1]

ans = dp[m-1]
print("{}".format(ans))