h,w,m = map(int,input().split())
mod = 998244353
ans = 1
bh,bw = 1,1
for i in range(m-1)[::-1]:
    dif = m-i
    nh,nw = pow(dif,h,mod),pow(dif,w,mod)
    ans = (ans+(nh-bh)*(nw-bw))%mod
    bh,bw = nh,nw
print(ans)