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#include <bits/stdc++.h>
using namespace std;
long a[17][17];
int n,m,i,j;
long backmax(int x, int y){
long 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{
sum+=a[i][j];}
return sum;
}
int main()
{
ifstream f("flip.in");
ofstream g("flip.out");
f>>n>>m;
for (i=1;i<=n;i++)
for (j=1;j<=m;j++) f>>a[i][j];
long 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;
maxim=0;
f.close();
g.close();
return 0;
}