import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353

n, p, q = mi()
if n > 5000:
    raise Exception
a = list(range(1, n + 1))
s = set()
s.add(tuple(a))
for i in range(n):

    a = a[:p][::-1] + a[p:]
    s.add(tuple(a))
    a = a[:n - q] + a[n - q:][::-1]
    s.add(tuple(a))

print(len(s) % 998244353)