#include<stdio.h>
#include<vector>
using namespace std;
int v,n,m,i,j,bms,ls,ms;
vector<int> S,M[16];
void read(),solve(),back(int c);
int main()
{
	read();
	solve();
	return 0;	
}
void read()
{
	
	freopen("flip.in","r",stdin);
	freopen("flip.out","w",stdout);
	scanf("%d%d",&n,&m);
	for(i=0;i<n;i++)
	{
		for(j=0;j<m;j++)
		{
			scanf("%d",&v);
			M[i].push_back(v);
		}
	}
}
void solve()
{
	for(j=0;j<m;j++)S.push_back(1);
	back(1);
	printf("%d\n",bms);
}
void back(int c)
{
	if(c==m)
	{
		ms=0;
		for(i=0;i<n;i++)
		{
			ls=M[i][0];
			for(j=1;j<m;j++)
				ls+=S[j]*M[i][j];
			ls=ls<0?-ls:ls;
			ms+=ls;
		}
		bms=ms>bms?ms:bms;
		return;
	}
	S[c]= 1;
	back(c+1);
	S[c]=-1;
	back(c+1);
}