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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int main()
{int m,n,a[16][16],i,j,s=0,s1,k;
f>>m>>n;
for(i=0;i<=m-1;i++) for(j=0;j<=n-1;j++) f>>a[i][j];
for(i=0;i<=m-1;i++) {s1=0; for(j=0;j<=n-1;j++) s1+=a[i][j]; if(s1<0) for(k=0;k<=n-1;k++) a[i][j]=-a[i][k];}
for(i=0;i<=n-1;i++) {s1=0; for(j=0;j<=m-1;j++) s1+=a[i][j]; if(s1<0) for(k=0;k<=m-1;k++) a[i][j]=-a[i][k];}
for(i=0;i<=m-1;i++) for(j=0;j<=n-1;j++) s+=a[i][j];
g<<s;
return 0;}