#include<stdio.h>   
int main()   
{long i, j, p=1, sum, s, smax=0, t[20][20], x[20];   
 int k, l, n, m, y[20];   
 freopen("flip.in", "r", stdin);   
 freopen("flip.out", "w", stdout);   
 scanf("%d%d", &n, &m);   
 for (i=1; i<=n; i++)   
   for (j=1; j<=m; j++)   
     scanf("%ld", &t[i][j]);   
 p=(p<<n)-1;   
 for (i=1; i<=p; i++)   
   {for (j=1; j<=n; j++)   
      y[j]=i>>(j-1)& 1;   
    for (k=1; k<=m; k++)   
      {sum=0;   
       for (l=1; l<=n; l++)   
    if (y[l]==1) sum-=t[l][k];   
     else sum+=t[l][k];   
       if (sum<0) x[k]=-sum;   
       else x[k]=sum;   
      }   
    s=0;   
    for (k=1; k<=m; k++)   
      s=s+x[k];   
    if (s>smax) smax=s;   
   }   
 printf("%ld", smax);   
 return 0;   
}