H,W,M = map(int,input().split())
ans = 0
P = 998244353
for s in range(M):
    tmp = pow(s + 1,H,P) - pow(s,H,P)
    tmp2 = pow(s+1,W,P) - pow(s,W,P)
    ans = (ans + tmp * tmp2 % P) % P
print(ans)