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#include<iostream>
#include<fstream>
using namespace std;
int N,M,s1,s2,S,i,j,m[16][16];
int main()
{
fstream f("flip.in",ios::in),
g("flip.out",ios::out);
f>>N>>M;
for(i=0;i<N;i++)
{
for(j=0;j<M;j++)
f>>m[i][j];
for(j=0;j<M;j++)
{
s1=s1+m[i][j];
s2=s2+(m[i][j]*-1);
}
if(s2>s1)
for(j=0;j<M;j++)
m[i][j]=m[i][j]*-1;
s1=0;s2=0;
}
s1=0;s2=0;
for(i=0;i<M;i++)
{
for(j=0;j<N;j++)
{
s1=s1+m[j][i];
s2=s2+(m[j][i]*-1);
}
if(s2>s1)
for(j=0;j<N;j++)
m[j][i]=m[j][i]*-1;
s1=0;s2=0;
for(j=0;j<N;j++)
S=S+m[j][i];
}
g<<S;
}