int n;
int a[3][3];
int was[3][3];
ll ans;

bool check(int x, int y)
{
    return x >= 0 && x < 3 && y >= 0 && y < 3;
}

void gen(int x, int y, ll res)
{
    was[x][y] = 1;
    res = res * 10 + a[x][y];
    ans = max(res, ans);
    if (check(x + 1, y) && !was[x + 1][y])
        gen(x + 1, y, res), was[x + 1][y] = 0;
    if (check(x - 1, y) && !was[x - 1][y])
        gen(x - 1, y, res), was[x - 1][y] = 0;
    if (check(x, y - 1) && !was[x][y - 1])
        gen(x, y - 1, res), was[x][y - 1] = 0;
    if (check(x, y + 1) && !was[x][y + 1])
        gen(x, y + 1, res), was[x][y + 1] = 0;
}

int main()
{
    n = 3;
    for (int i = 0; i < n; ++i)
        for (int j = 0; j < n; ++j)
            cin >> a[i][j];
    for (int i = 0; i < n; ++i)
    {
        for (int j = 0; j < n; ++j)
        {
            for (int i1 = 0; i1 < n; ++i1)
                for (int j1 = 0; j1 < n; ++j1)
                    was[i1][j1] = 0;
            gen(i, j, 0);
        }
    }
    cout << ans;
    return 0;
}