#include<bits/stdc++.h>
using namespace std;
using ll = long long;


#include<atcoder/modint>
using mint = atcoder::modint998244353;
using B = bitset<1000>;
#include<atcoder/dsu>
int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false); 
   
    int h,w;
    cin>>h>>w;
    vector<vector<ll>> a(h,vector<ll>(w,0));
    for(int i = 0;i<h;i++) for(int j = 0;j<w;j++) cin>>a[i][j];
    vector<pair<ll,pair<int,int>>> use;
    for(int i = 0;i<h;i++) for(int j = 0;j<w;j++) use.push_back(make_pair(a[i][j],make_pair(i,j)));
    sort(use.rbegin(),use.rend());
    mint ans = 0;
    mint now = mint(2).pow(h+w-1);
    int cnt = h + w - 1;

    vector<vector<int>> ok(h,vector<int>(w,0));
    vector<B> c(w);
    atcoder::dsu uf(w);
    for(int i = 0;i<use.size();i++){
        int ni = use[i].second.first;
        int nj = use[i].second.second;
        if(c[nj][ni]) continue;
        int nxt = cnt - 1;
        ans += mint(a[ni][nj]) * (mint(2).pow(cnt)-mint(2).pow(nxt));
        cnt--;
        c[nj].set(ni);
        for(int j = 0;j<w;j++) for(int k = j + 1;k<w;k++) if((c[j]&c[k]).count()>0) uf.merge(j,k);
        for(auto&now:uf.groups()){
            B use;
            for(auto&j:now) use |= c[j];
            for(auto&j:now) c[j] = use;
        }
    }
    cout<<ans.val()<<endl;

    
}