import sys,bisect
input=lambda:sys.stdin.readline().rstrip()
mod=998244353
N,X,Y=map(int,input().split())
if X>Y:
	X,Y=Y,X
N=Y-X+1-(X>1)-(Y<N)
dp=[0 for i in range(max(N+1,3))]
dp[1],dp[2]=1,1
for i in range(3,N+1):
	dp[i]=(dp[i-1]+dp[i-3])%mod
print(dp[N])