For the elementary reaction, 
$2NO\left(g\right)+O_2\left(g\right)\stackrel{ }{\to }2N{O}_2\left(g\right)$
 the rate of the reaction is $0.01mol\text{}{L}^{-1}{s}^{-1}$ when the concentration of $NO\left(g\right)and{O}_2\left(g\right)$  respectively are $0.1mol\text{}{L}^{-1}$ and  $0.2mol\text{}{L}^{-1}.$  If the rate constant for this reaction is  $Nmol{\text{}}^x{L}^y{s}^z$, the value of $(N+x-y-z)$ is____.