H,W,M = map(int,input().split())
P = 998244353

import sys

if M < H + W - 1:
	print(0)
	exit()
	
ans = 0

def calc(N,K):
	ue = N
	ueseki = N
	sita = 1
	sitaseki = 1
	for i in range(2,K + 1):
		ue -= 1
		ueseki = ueseki * ue % P
		sita += 1
		sitaseki = sitaseki * seita % P
	return ueseki * pow(sitaseki,P - 2,P) % P
ans = calc(H + W - 2,H - 1) * calc(M,H + W - 1) % P
print(ans)