# pragma GCC optimize("O3")
# include <bits/stdc++.h>
std::pair<int,int> DR[] = {{-1,0},{0,1},{1,0},{0,-1},{-1,1},{-1,-1},{1,1},{1,-1}};
# define ll long long
# define clock (clock() * 1000.0 / CLOCKS_PER_SEC)
# define rc(s) return cout << s,0
# define _ ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
# define db(x) cerr << #x << " = " << x << '\n'
# define pb push_back
# define mp make_pair
# define all(s) s.begin(),s.end()
# define sz(x) (int)((x).size())
# define int ll
using namespace std;

int ans,n,m,a[17][17];

int32_t main(){_
    freopen("flip.in","r",stdin);
    freopen("flip.out","w",stdout);
	cin >> n >> m;
	for(int i = 0;i < n;i++)
	{
		for(int j = 0;j < m;j++)
		{
			cin >> a[i][j];
		}
	}
	for(int mask = 0;mask < (1LL << n);mask++)
	{
		int summ = 0;
		for(int j = 0;j < m;j++)
		{
			int suma = 0;
			for(int i = 0;i < n;i++)
			{
				int x = a[i][j];
				if(mask & (1LL << i)) x = -x;
				suma += x;
			}
			summ += abs(suma);
		}
		ans = max(ans,summ);
	}
	rc(ans);
}