#include <iostream>
#include <cstdio>
#include <limits.h>

using namespace std;

int c_min (int a[][20], int n, int m){
    int mi=INT_MAX, c;
    for (int j=1; j<=m; j++){
        int sum=0;
        for (int i=1; i<=n; i++)
                sum+=a[i][j];
        if (sum < mi){
            mi=sum;
            c=j;
        }
    }
    return c;
}

int l_min (int a[][20], int n, int m){
    int mi=INT_MAX, l;
    for (int j=1; j<=n; j++){
        int sum=0;
        for (int i=1; i<=m; i++)
                sum+=a[j][i];
        if (sum < mi){
            mi=sum;
            l=j;
        }
    }
    return l;
}

int main()
{
    freopen("flip.in","r",stdin);
    freopen("flip.out","w",stdout);
    int a[20][20],n,m,i,j, su=0;
    cin>>n>>m;
    for (i=1; i<=n; i++)
        for (j=1; j<=m; j++)
            cin>>a[i][j];
    int col_m=c_min(a,n,m), lin_m=l_min(a,n,m);
    for (i=1; i<=n; i++)
        for (j=1; j<=m; j++)
            if (j==col_m || i==lin_m)
                su+=a[i][j]*(-1);
            else su+=a[i][j];
    cout<<su;
    return 0;
}