MOD = 998244353

def main():
    import sys
    N, B, W = map(int, sys.stdin.readline().split())
    K = N - W
    if K < B:
        print(0)
        return
    if (K - B) % 2 != 0:
        print(0)
        return
    t = (K - B) // 2
    if t < 1:
        print(0)
        return
    
    from math import comb
    if B < t:
        print(0)
        return
    ways = comb(B-1, t-1)
    
    total_occupied = K + (t - 1)
    if total_occupied > N:
        print(0)
        return
    
    available = N - total_occupied
    ways *= comb(available + t, t)
    ways %= MOD
    print(ways % MOD)

if __name__ == '__main__':
    main()