#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;     
}