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#include <iostream>
using namespace std;
int main()
{
int n,m,s1,s2,i,j,v[100][100],s=0;
cin>>n>>m;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
cin>>v[i][j];
}
j=1;
do
{
s1=0; s2=0;
for(i=1;i<=n;i++)
{
s1=s1+v[i][j];
s2=s2+v[i][j]*(-1);
}
if(s2>s1) v[i][j]=v[i][j]*(-1);
j++;
}
while(j!=m);
i=1;
do
{
s1=0; s2=0;
for(j=1;j<=m;j++)
{
s1=s1+v[i][j];
s2=s2+v[i][j]*(-1);
}
if(s2>s1) v[i][j]=v[i][j]*(-1);
i++;
}
while(i!=n);
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
s=s+v[i][j];
}
cout<<s;
return 0;
}