MOD = 998244353
fib = [1, 1, 1]
for i in range(10 ** 6):
    fib.append((fib[-1] + fib[-3]) % MOD)

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

if mn == 1:
    L = 1
else:
    L = mn + 1
if mx == N:
    R = N
else:
    R = mx - 1

if L > R:
    print(0)
else:
    print(fib[R - L])