def comb(a,b):
	ret=1
	for i in range(b):
		ret*=a-i
		ret*=pow(i+1,-1,998244353)
		ret%=998244353
	return ret

comb_init()
H,W,M=map(int,input().split())
print((comb(M,H+W-1)*pow(M,H*W-H-W+1,998244353)*comb(H+W-2,H-1))%998244353)