The temperature of an open room of volume $30\,\text{m}^3$ increases from $17^\circ\text{C}$ to $27^\circ\text{C}$ due to the sunshine. The atmospheric pressure in the room remains $1 \times 10^5\,\text{Pa}$. If $n_i$ and $n_f$ are the number of molecules in the room before and after heating, then $n_f - n_i$ will be: