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