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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream x("flip.in");
ofstream y("flip.out");
int m,n,sp,s1,s2,i,j;
int v[20][20];
x>>n;
x>>m;
s1=0;
s2=0;
for(i=0;i<n;i++)
for (j=0;j<m;j++)
x>>v[i][j];
for(j=0;j<m;j++)
{sp=0;
for (i=0;i<n;i++)
sp=sp+v[i][j];
if (sp<0)
for (i=0;i<n;i++)
v[i][j]=0-v[i][j];}
for(i=0;i<n;i++)
for (j=0;j<m;j++)
s1=s1+v[i][j];
for(i=0;i<n;i++)
{sp=0;
for (j=0;j<m;j++)
sp=sp+v[i][j];
if (sp<0)
for (j=0;j<m;j++)
v[i][j]=0-v[i][j];}
for(i=0;i<n;i++)
for (j=0;j<m;j++)
s2=s2+v[i][j];
if (s1>s2) y<<s1;
else y<<s2;
x.close();
y.close();
return 0;
}