#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define ALL(x) (x).begin(), (x).end()
#ifdef LOCAL
#include "debug.hpp"
#else
#define debug(...) void(0)
#endif

template <typename T> istream& operator>>(istream& is, vector<T>& v) {
    for (T& x : v) is >> x;
    return is;
}
template <typename T> ostream& operator<<(ostream& os, const vector<T>& v) {
    for (size_t i = 0; i < v.size(); i++) {
        os << v[i] << (i + 1 == v.size() ? "" : " ");
    }
    return os;
}

template <typename T> T gcd(T x, T y) { return y != 0 ? gcd(y, x % y) : x; }
template <typename T> T lcm(T x, T y) { return x / gcd(x, y) * y; }

int topbit(signed t) { return t == 0 ? -1 : 31 - __builtin_clz(t); }
int topbit(long long t) { return t == 0 ? -1 : 63 - __builtin_clzll(t); }
int botbit(signed a) { return a == 0 ? 32 : __builtin_ctz(a); }
int botbit(long long a) { return a == 0 ? 64 : __builtin_ctzll(a); }
int popcount(signed t) { return __builtin_popcount(t); }
int popcount(long long t) { return __builtin_popcountll(t); }
bool ispow2(int i) { return i && (i & -i) == i; }
long long MSK(int n) { return (1LL << n) - 1; }

template <class T> T ceil(T x, T y) {
    assert(y >= 1);
    return (x > 0 ? (x + y - 1) / y : x / y);
}
template <class T> T floor(T x, T y) {
    assert(y >= 1);
    return (x > 0 ? x / y : (x - y + 1) / y);
}

template <class T1, class T2> inline bool chmin(T1& a, T2 b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template <class T1, class T2> inline bool chmax(T1& a, T2 b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

template <typename T> void mkuni(vector<T>& v) {
    sort(v.begin(), v.end());
    v.erase(unique(v.begin(), v.end()), v.end());
}
template <typename T> int lwb(const vector<T>& v, const T& x) { return lower_bound(v.begin(), v.end(), x) - v.begin(); }

const int INF = (1 << 30) - 1;
const long long IINF = (1LL << 60) - 1;
const int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
const int MOD = 998244353;
// const int MOD = 1000000007;

#include <iostream>
#include "atcoder/modint"

namespace atcoder {

template <int MOD> std::istream& operator>>(std::istream& is, static_modint<MOD>& x) {
    int64_t v;
    x = static_modint<MOD>{(is >> v, v)};
    return is;
}

template <int MOD> std::ostream& operator<<(std::ostream& os, const static_modint<MOD>& x) { return os << x.val(); }

template <int ID> std::ostream& operator<<(std::ostream& os, const dynamic_modint<ID>& x) { return os << x.val(); }

}  // namespace atcoder

#include <algorithm>
#include <cassert>
#include <vector>

struct UnionFind {
    UnionFind(int n) : n(n), num(n), data(n, -1) {}

    int find(int x) {
        assert(0 <= x && x < n);
        return data[x] < 0 ? x : data[x] = find(data[x]);
    }

    bool merge(int x, int y) {
        assert(0 <= x && x < n);
        assert(0 <= y && y < n);
        if ((x = find(x)) == (y = find(y))) return false;
        if (-data[x] < -data[y]) std::swap(x, y);
        data[x] += data[y];
        data[y] = x;
        num--;
        return true;
    }

    bool same(int x, int y) {
        assert(0 <= x && x < n);
        assert(0 <= y && y < n);
        return find(x) == find(y);
    }

    int size(int x) {
        assert(0 <= x && x < n);
        return -data[find(x)];
    }

    int count() const { return num; }

    std::vector<std::vector<int>> groups() {
        std::vector<std::vector<int>> res(n);
        for (int i = 0; i < n; i++) res[find(i)].emplace_back(i);
        res.erase(std::remove_if(res.begin(), res.end(), [&](const std::vector<int>& v) { return v.empty(); }));
        return res;
    }

    int operator[](int x) { return find(x); }

private:
    int n, num;
    // root node : -1 * component size
    // otherwise : parent
    std::vector<int> data;
};

using mint = atcoder::modint998244353;

// 前の行と反転 or 一致

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int H, W;
    cin >> H >> W;
    vector<vector<int>> A(H, vector<int>(W));
    cin >> A;

    mint ans = 0;
    UnionFind UF(H + W);
    vector<int> cand;
    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {
            cand.emplace_back(A[i][j]);
        }
    }
    mkuni(cand);
    int sz = cand.size();
    vector<vector<pair<int, int>>> pos(sz);
    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {
            pos[lwb(cand, A[i][j])].emplace_back(i, j);
        }
    }
    mint pre = mint(2).pow(H + W);
    for (int i = sz - 1; i >= 0; i--) {
        for (auto [x, y] : pos[i]) UF.merge(x, y + H);
        mint nxt = mint(2).pow(UF.count());
        ans += (pre - nxt) * cand[i];
        pre = nxt;
    }
    ans /= 2;

    cout << ans << '\n';
    return 0;
}