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

int main()
{
    FILE *f,*g;
    int m,n,i,j;
    long t[16][16],s,sum;
    f=fopen("flip.in","r");
    g=fopen("flip.out","w");
    fscanf(f,"%d %d",&n,&m);
    printf("%d",n);
    for (i=0;i<n;i++)
        {
            s=0;
            for(j=0;j<m;j++)
            {
              fscanf(f, "%ld",&t[i][j]);
              s=s+t[i][j];
            }
            if(s<0)
                for(j=0;j<m;j++)
                    t[i][j]=-t[i][j];

        }
     sum=0;
     for (j=0;j<m;j++)
           {
               s=0;
               for (i=0;i<n;i++)
                    s=s+t[i][j];
               if (s<0) sum=sum-s;
                        else sum=sum+s;
           }
    fprintf(g,"%ld",sum);
    fclose(f);
    fclose(g);
    return 0;
}