MOD = 998244353

def main():
    import sys
    input = sys.stdin.read().split()
    N = int(input[0])
    B = int(input[1])
    W = int(input[2])
    
    if B < 0 or W < 0 or (B + W) > N:
        print(0)
        return
    
    max_n = B + W
    if max_n == 0:
        print(1 if B == 0 and W == 0 else 0)
        return
    
    # 预计算阶乘和逆阶乘
    fact = [1] * (max_n + 1)
    for i in range(1, max_n + 1):
        fact[i] = fact[i-1] * i % MOD
    
    inv_fact = [1] * (max_n + 1)
    inv_fact[max_n] = pow(fact[max_n], MOD-2, MOD)
    for i in range(max_n-1, -1, -1):
        inv_fact[i] = inv_fact[i+1] * (i+1) % MOD
    
    def comb(n, k):
        if n < 0 or k < 0 or k > n:
            return 0
        return fact[n] * inv_fact[k] % MOD * inv_fact[n - k] % MOD
    
    res = comb(B + W, B)
    print(res)

if __name__ == "__main__":
    main()