#include<iostream>
#include<vector>
#include<algorithm>
#include<tuple>
using namespace std;
using ll=long long;
#define rep(i,n) for(int i=0;i<n;i++)
#define rrep(i,n) for(int i=(n)-1;i>=0;i--)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}
template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}

const ll MOD=998244353;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int h,w;
    cin>>h>>w;
    vector<vector<ll>>A(h,vector<ll>(w));
    vector<tuple<ll,int,int>>V;
    rep(i,h)rep(j,w){
        cin>>A[i][j];
        V.push_back(make_tuple(A[i][j],i,j));
    }
    sort(rall(V));
    ll ans=0;
    vector<ll>P(h+w);
    P[0]=1;
    rep(i,h+w-1)P[i+1]=(2*P[i])%MOD;
    int x=h+w-2;
    vector<bool>F(h),G(w);
    for(auto[c,i,j]:V){
        if(x>=0&&(!F[i]||!G[j])){
            F[i]=true;
            G[j]=true;
            ans+=c*P[x]%MOD;
            ans%=MOD;
            x--;
        }
    }
    cout<<ans<<"\n";
}