Consider the Karnaugh map given below, where \(X\) represents "don't care" and…

Consider the Karnaugh map given below, where $X$ represents "don't care" and blank represents 0.

Assume for all inputs $\left ( a,b,c,d \right )$, the respective complements $\left ( \bar{a}, \bar{b}, \bar{c}, \bar{d} \right )$ are also available. The above logic is implemented using 2-input NOR gates only. The minimum number of gates required is ____________ .