H, W, M = map(int, input().split())
MOD = 998244353
ans = 0
sumh = 0
sumw = 0
for a in range(1, M + 1):
    tmph = pow(a, H, MOD) - sumh
    tmpw = pow(a, W, MOD) - sumw
    ans += tmph * tmpw
    ans %= MOD
    sumh += tmph
    sumh %= MOD
    sumw += tmpw
    sumw %= MOD
print(ans)