mod=998244353
h,w,m=map(int,input().split())
if m<h+w-1:
	print(0)
	exit()
def fact(x):
	ret=1
	for i in range(1,x+1):
		ret=(ret*i)%mod
	return ret
C=fact(h+w-2)*pow(fact(h-1)*fact(w-1),-1,mod)
D=fact(h+w-1)*pow(fact(m)*fact(h-w-1-m),-1,mod)
ans=C*D*pow(3,h*w-(h+w-1),mod)%998244353
print(ans)