A machine part in the form of cantilever beam is subjected to fluctuating load as shown in the figure The load varies from $\text{800 N}$ to $\text{1600 N}$. The modified endurance. yield and ultimate strengths of the material are $\text{200 MPa}$, $\text{500 MPa}$ and $\text{600 MPa}$, respectively.
The factor of safety of the beam using modified Goodman criterion is ____________________ ($\textit{round off to one decimal place}$).