if (global.flag[1360] > 0)
{
    global.entrance = global.flag[1360];
}
else if (is_real(doorEntrance))
{
    if (doorEntrance != -1)
        global.entrance = doorEntrance;
}
else if (is_string(doorEntrance))
{
    global.entrance = (ord(string_upper(doorEntrance)) - 65) + 1;
}
global.flag[21] = -10;