#include <stdio.h>

int main() {
    freopen("flip.in", "r", stdin);
    freopen("flip.out", "w", stdout);
    int n, m, i, j, k, a[17][17] = {}, s, ans;
    scanf("%d%d", &n, &m);
    for(i = 1; i <= n; ++i)
        for(j = 1; j <= m; ++j) {
            scanf("%d", &a[i][j]);
            a[i][0] += a[i][j];
            a[0][j] += a[i][j];
            a[0][0] += a[i][j];
        }
    ans = a[0][0];
    for(k = 1; k < 1<<(n+m); ++k) {
        s = a[0][0];
        for(i = 1; i <= n; ++i)
            if(k & (1 << (i-1)))
                s -= a[i][0] << 1;
        for(j = 1; j <= m; ++j)
            if(k & (1 << (j-1+n)))
                s -= a[0][j] << 1;
        if(s > ans)
            ans = s;
    }
    printf("%d\n", ans);
}