import sys
#input = sys.stdin.readline #文字列につけてはダメ
input = sys.stdin.buffer.readline #文字列につけてはダメ
#sys.setrecursionlimit(1000000)
#import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
#from collections import defaultdict 
#from collections import deque
#import copy
#import math
#from functools import lru_cache
#@lru_cache(maxsize=None)
#MOD = pow(10,9) + 7
MOD = 998244353
#dx = [1,0,-1,0]
#dy = [0,1,0,-1]

def main():
    H,W,M = map(int,input().split())
    ans = 0
    for i in range(1,M+1):
        m = M - i + 1 #残り選べる数字
        temp = (pow(m,H,MOD) - pow(m-1,H,MOD)) * (pow(m,W,MOD) - pow(m-1,W,MOD))
        ans += temp
        ans %= MOD
    print(ans)


if __name__ == '__main__':
    main()