Q51

A processor has $16$ integer registers $\text{(R0, R1}, \ldots ,\text{ R15)}$ and $64$ floating point registers $\text{(F0, F1}, \ldots , \text{F63)}.$ It uses a $2\text{- byte}$ instruction format. There are four categories of instructions: $\text{Type-1, Type-2, Type-3},$ and $\text{Type-4. Type-1}$ category consists of four instructions, each with $3$ integer register operands $\text{(3Rs). Type-2}$ category consists of eight instructions, each with $2$ floating point register operands $\text{(2Fs). Type-3}$ category consists of fourteen instructions, each with one integer register operand and one floating point register operand $\text{(1R+1F). Type-4}$ category consists of $\text{N}$ instructions, each with a floating point register operand $\text{(1F)}.$ The maximum value of $\text{N}$ is _________.