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#include <bits/stdc++.h>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int main()
{
long long smax,sum;
int a[17][17]; int i,j,n,m;
f>>n>>m;
for (int i=1; i<=n; i++)
for (int j=1; j<=m; j++)
f >>a[i][j];
sum=0;
for (int i=1; i<=n; i++)
for (int j=1; j<=m; j++)
sum+=a[i][j];
smax=sum;
for (int i=1; i<=n; i++)
for (int j=1; j<=m; j++)
{
sum=0;
for (int l=1; l<=n; l++)
for (int c=1; c<=m; c++)
{
if (i==l && j==c) sum+=a[l][c]; else {
if (i==l || j==c) sum-=a[l][c]; else sum+=a[l][c];
}
}
if (sum>smax) smax=sum;
}
g<<smax;
f.close();
g.close();
return 0;
}