#include <cstdio>
#include <cstring>
int n, m, a[90];
struct bigint
{
    int data[80], len;
    void refresh()
    {
        for (int i = 0; i < 30; i++)
            data[i + 1] += data[i] / 10, data[i] %= 10;
        for (len = 70; len >= 0 && data[len] == 0; len--)
            ;
        if (len < 0) len = 0;
        len++;
    }
    bigint(int val = 0)
    {
        memset(data, 0, sizeof(data));
        data[0] = val;
        refresh();
    }
    bigint operator+=(const bigint &rhs)
    {
        for (int i = 0; i < rhs.len; i++)
            data[i] += rhs.data[i];
        refresh();
        return *this;
    }
    bigint operator+(const bigint &rhs)
    {
        bigint ret = *this;
        return ret += rhs;
    }
    bigint operator*(const bigint &rhs)
    {
        bigint ret;
        for (int i = 0; i < len; i++)
            for (int j = 0; j < rhs.len; j++)
                ret.data[i + j] += (data[i] * rhs.data[j]);
        ret.refresh();
        return ret;
    }
};
bigint max(const bigint &a, const bigint &b)
{
    if (a.len > b.len) return a;
    if (a.len < b.len) return b;
    for (int len = a.len; len >= 0; len--)
        if (a.data[len] > b.data[len])
            return a;
        else if (a.data[len] < b.data[len])
            return b;
    return b;
}
bigint _2n[90], f[90][90], tmp, ans;
int main()
{
    scanf("%d%d", &n, &m);
    _2n[0] = 1;
    for (int i = 1; i <= m; i++) _2n[i] = _2n[i - 1] * 2;
    for (int x = 1; x <= n; x++)
    {
        tmp = 0;
        memset(f, 0, sizeof(f));
        memset(a, 0, sizeof(a));
        for (int i = 1; i <= m; i++)
            scanf("%d", &a[i]);
        for (int i = 1; i <= m; i++)
        {
            f[i][0] = f[i - 1][0] + _2n[i] * a[i];
            f[0][i] = f[0][i - 1] + _2n[i] * a[m - i + 1];
        }
        for (int i = 1; i <= m; i++)
            for (int j = 1; j <= m - i; j++)
                f[i][j] = max(f[i - 1][j] + _2n[i + j] * a[i], f[i][j - 1] + _2n[i + j] * a[m - j + 1]);
        for (int i = 0; i <= m; i++) tmp = max(tmp, f[i][m - i]);
        ans += tmp;
    }
    int len = 40;
    for (; len > 0 && ans.data[len] == 0; len--)
        ;
    for (; len >= 0; len--) printf("%d", ans.data[len]);
    return 0;
}