MOD = 998244353
N,X,Y = map(int,input().split())
if X > Y:
    X,Y = Y,X
D = Y - X
if D == 1:
    if X == 1 or Y == N:
        print(1)
    else:
        print(0)
    exit()
if X > 1:
    D -= 1
if Y < N:
    D -= 1
dp = [0] * (D + 1)
dp[0] = 1
for i in range(1,D + 1):
    dp[i] += dp[i-1]
    if i >= 3:
        dp[i] += dp[i-3]
    dp[i] %= MOD
print(dp[-1])