n,x,y = map(int,input().split())
if x > y:
    x,y = y,x

if x != 1:
    x += 1
if y != n:
    y-=1

if y-x < 0:
    print(0)
elif y-x < 2:
    print(1)
else:
    dp = [[0]*2 for i in range(n+4)]
    dp[0][0] = 1
    dp[1][1] = 1
    dp[2][1] = 1
    dp[3][1] = 1
    mod = 998244353
    for i in range(1,n+1):
        dp[i][0] += dp[i-1][1] + dp[i-1][0]
        dp[i+3][1] += dp[i][0] + dp[i][1]
        dp[i][0] %= mod
        dp[i+3][1] %= mod
    print(sum(dp[y-x-2])%mod)