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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream x("flip.out");
int main()
{
int a, b, r[1000000][1000000], i, j, s=0;
f>>a;
f>>b;
for(i=0;i<a;i++)
{
for(j=0;j<b;j++)
{
f>>r[i][j];
}
}
j=0;
for(i=0;i<a;i++)
{
while(j<b)
{
s=s+r[i][j];
j++;
}
if(s<0)
{
j=0;
while(j<b)
{
r[i][j]=(-1)*r[i][j];
j++;
}
}
j=0;
s=0;
}
i=0;
for(j=0;j<b;j++)
{
while(i<a)
{
s=s+r[i][j];
i++;
}
if(s<0)
{
i=0;
while(i<a)
{
r[i][j]=(-1)*r[i][j];
i++;
}
}
i=0;
s=0;
}
for(i=0;i<a;i++)
{
for(j=0;j<b;j++)
{
s=s+r[i][j];
}
}
x<<s;
return 0;
}