# -*- coding: utf-8 -*-

H, W, M = map(int,input().split())
mod = 998244353

powH = [pow(i, H, mod) for i in range(M+1)]
powW = [pow(i, W, mod) for i in range(M+1)]

ans = 0
for i in range(1, M+1):
    ans += (powH[i] - powH[i-1] + mod) * (powW[i] - powW[i-1] + mod) 
    ans %= mod

print(ans)