// Validator
#include "testlib.h"

#include <cstdio>
#include <atcoder/modint>
using mint = atcoder::modint998244353;

int main(int argc, char **argv) {
    registerValidation(argc, argv);
    int H = inf.readInt(1, 200000);
    inf.readSpace();
    int W = inf.readInt(1, 200000);
    inf.readSpace();
    int M = inf.readInt(1, 200000);
    inf.readEoln();
    inf.readEof();

    mint ret = 0;
    for (int lo = 1; lo < M; ++lo) ret += (mint(M - lo + 1).pow(H) - mint(M - lo).pow(H)) * (mint(M - lo + 1).pow(W) - mint(M - lo).pow(W));
    printf("%d\n", (ret + 1).val());
}