n, x, y = map(int, input().split())
mod = 998244353

def sub(d):
  dp = [0] * (d + 1)
  dp[0] = 1
  for i in range(d):
    dp[i + 1] += dp[i]
    dp[i + 1] %= mod
    if i + 3 <= d:
      dp[i + 3] += dp[i]
      dp[i + 3] %= mod
  return dp[d]

if x > y:
  x, y = y, x
x0 = x + (0 if x == 1 else 1)
y0 = y - (0 if y == n else 1)
d = y0 - x0
if d < 0:
  print(0)
else:
  print(sub(d))