/*
 * flip.c
 *
 *  Created on: 09.04.2013
 *      Author: Alex
 */

#include <stdio.h>
#include <stdlib.h>

int main()
{
	FILE *f1=0;
	f1=fopen("flip.in", "r");
	FILE *f2=0;
	f2=fopen("flip.out", "w");
	int i,j;
	long N,M,a[100][100], b[100][100], suma1=0, suma2=0, suma=0;
	fscanf(f1, "%ld%ld", &N, &M);
	for(i=0; i<N; ++i)
	{
		suma1=0;
		suma2=0;
		for(j=0; j<M; ++j)
		{
			fscanf(f1, "%ld", &a[i][j]);
			suma1=suma1+a[i][j];
			b[i][j]=(-1)*a[i][j];
			suma2=suma2+b[i][j];
		}
		if(suma1 < suma2)
		{
			//suma=suma+suma2;
			for(j=0; j<M; ++j)
			{
				a[i][j]=(-1)*a[i][j];
			}
		}
		else
		{
			//suma=suma+suma1;
		}
	}
	for(j=0; j<M; ++j)
	{
		suma1=0;
		suma2=0;
		for(i=0; i<N; ++i)
		{
			suma1=suma1+a[i][j];
			b[i][j]=(-1)*a[i][j];
			suma2=suma2+b[i][j];
		}
		if(suma1 < suma2)
				{
					suma=suma+suma2;
					for(i=0; i<N; ++i)
					{
						a[i][j]=(-1)*a[i][j];
					}
				}
				else
				{
					suma=suma+suma1;
				}
	}
	fprintf(f2, "%ld", suma);
	fclose(f1);
	fclose(f2);
	return 0;
}