#include <bits/stdc++.h>

using namespace std;
int a[17][17];
int n,m,i,j;
int backmax(int x, int y){
int sum=0;

for (int i=1;i<=n;i++)
    for (int j=1;j<=m;j++)
    if ((x==i)&&(y==j)) sum-=a[i][j] ;else {
    if ((x==i)||(y==j)) sum-=a[i][j]; else{
        sum+=a[i][j];}}
    return sum;
    }


int main()
{
ifstream f("flip.in");
ofstream g("flip.out");

    f>>n>>m;
    cout<<n;
   for (i=1;i<=n;i++)
    for (j=1;j<=m;j++) f>>a[i][j];
int maxim=0;
for (i=1;i<=n;i++)
    for (j=1;j<=m;j++)


        if (maxim <backmax(i,j)) maxim=backmax(i,j);




g<<maxim << endl;
    return 0;
}