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

int n,m,a[17][17],i,j;
long sum,maxi;

int suma(int i, int j)
{	
	long x = 0;
	for(int k = 0; k < n; k++)
		for(int l = 0; l < m; l++) 
			if(k == i || l == j) 
				x += -1*a[k][l];
			  else x += a[k][l];
	return x;
}

int main()
{	
	FILE*in,*out;
	in = fopen("flip.in","r");
	out = fopen("flip.out","w");
	fscanf(in,"%d",&n);
	fscanf(in,"%d",&m);
	for(i = 0; i < n; i++)
		for(j = 0; j < m; j++) 
			fscanf(in,"%d",&a[i][j]);
	for(i = 0; i < n; i++)
		for(j = 0; j < m; j++) 
			if(suma(i,j)>=maxi) 
				maxi = suma(i,j);
	fprintf(out,"%d",maxi);
	fclose(in);
	fclose(out);
	return 0;
}