N, X, Y = map(int, input().split())
X, Y = min(X, Y), max(X, Y)

if X>1:
    X += 1

if Y<N:
    Y -= 1

if Y-X<0:
    exit(print(0))
    
dp = [0]*(Y-X+1)
dp[0] = 1

for i in range(1, Y-X+1):
    dp[i] += dp[i-1]
    
    if i>=3:
        dp[i] += dp[i-3]
    
    dp[i] %= 998244353

print(dp[-1])