#line 1 "Main.cpp"
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <atcoder/modint>
#line 4 "nachia\\set\\dsu.hpp"

namespace nachia {

struct Dsu{
private:
    int N;
    std::vector<int> P;
    std::vector<int> H;
public:
    Dsu() : N(0) {}
    Dsu(int n) : N(n), P(n, -1), H(n) {
        for(int i=0; i<n; i++) H[i] = i;
    }
    int leader(int u){
        if(P[u] < 0) return u;
        int v = P[u];
        while(P[v] >= 0){ P[u] = P[v]; u = v; v = P[v]; }
        return P[u];
    }
    int append(){
        int n = P.size();
        P.push_back(-1);
        H.push_back(n);
        return n;
    }
    int label(int u){ return H[leader(u)]; }
    int operator[](int u){ return H[leader(u)]; }
    void merge(int u, int v, int newLabel){
        if(newLabel < 0) newLabel = u;
        u = leader(u);
        v = leader(v);
        if(u == v){ H[u] = newLabel; return; }
        N--;
        if(-P[u] < -P[v]) std::swap(u, v);
        P[u] += P[v];
        H[P[v] = u] = newLabel;
    }
    int merge(int u, int v){ merge(u, v, u); return u; }
    int count(){ return N; }
    int size(int u){ return -P[leader(u)]; }
    bool same(int u, int v){ return leader(u) == leader(v); }
};

} // namespace nachia
#line 7 "Main.cpp"
using namespace std;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;

int main(){
    int H, W; cin >> H >> W;
    Modint ans = 0;
    nachia::Dsu dsu(H+W);
    vector<vector<int>> A(H, vector<int>(W));
    rep(y,H) rep(x,W) cin >> A[y][x];
    vector<pair<int,int>> Q(H*W);
    rep(y,H) rep(x,W) Q[y*W+x] = {y,x};
    sort(Q.begin(), Q.end(), [&](auto l, auto r){ return A[l.first][l.second] > A[r.first][r.second]; });
    for(auto [y,x] : Q) if(!dsu.same(x,W+y)){
        ans += Modint(2).pow(dsu.count() - 2) * A[y][x];
        dsu.merge(x,W+y);
    }
    cout << ans.val() << endl;
    return 0;
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;