Set up all initial variables for all elements:
Global variables
$$a=0.266ppl/m^2$$
Staircase
$$ \begin{aligned}
L_{stairs} &= \sqrt{(10\times7)^2 +(10\times 11)^2} \\
&=3.3m \\ \\
k&=1.08m/s \\ \\
f_{max}&=1.01 ppl/s/m \\ \\
W_{eff}&=1.8-0.3 \\
&=1.5m \\ \\
F_{staircase, \;max}&=1.515 ppl/s \end{aligned}$$
Corridor
$$ \begin{aligned} k &= 1.4 m/s \\
f_{max}&=1.3 ppl/s/m \\
W_{eff}&=1.8-0.4 \\
&=1.4m \\
F_{corridor, \;max}&=1.82 ppl/s \end{aligned}$$
Door
$$ \begin{aligned}
f_{max}&=1.3 ppl/s/m\\
W_{eff} &=1.3-0.3 \\
&=1m \\
F_{door, \;max}&=1.3 ppl/s \end{aligned}$$