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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int main()
{int i , j , n , m , a[101][101], s, s1 ,st=0, p , k;
f>>n>>m;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)f>>a[i][j];
for(i=1;i<=n;i++){
s=0;s1=0;
for(j=1;j<=m;j++)
{
s=s+a[i][j];
s1=s1-a[i][j];
}
if(s1>s){p=i;
for(j=1;j<=m;j++)
a[p][j]=-a[i][j];
}}
for(j=1;j<=m;j++){
s=0;s1=0;
for(i=1;i<=n;i++)
{
s=s+a[i][j];
s1=s1-a[i][j];
}
if(s1>s){k=j;
for(i=1;i<=n;i++)a[i][k]=-a[i][j];}}
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
st=st+a[i][j];
g<<st;}