h, w, m = map(int, input().split())

mod = 998244353

ans = 0
for i in range(1, m+1):
    x = pow(m-i+1, h, mod)-pow(m-i, h, mod)
    y = pow(m-i+1, w, mod)-pow(m-i, w, mod)
    ans += x*y
    ans %= mod
print(ans)