MOD = 998244353

h, w, m = map(int, input().split())
ans = 0

for min_ in range(1, m + 1):
    hh = pow(m - min_ + 1, h, MOD) - pow(m - min_, h, MOD)
    ww = pow(m - min_ + 1, w, MOD) - pow(m - min_, w, MOD)
    ans += hh * ww
    ans %= MOD
print(ans)