MOD = 998244353

H, W, M = map(int, input().split())

ans = 0
for i in range(1, M + 1):
    cnt_H = pow(M - i + 1, H, MOD) - pow(M - i, H, MOD) 
    cnt_W = pow(M - i + 1, W, MOD) - pow(M - i, W, MOD) 
    ans += cnt_H * cnt_W
    ans %= MOD
    
print(ans)