Consider the following method:

public a$($String s$)\{$

int v $=0$;

for$($int x $=1$; x $<$ s$.$length; x$=$x$+1)\{$

if$($s$[$x$]==\text{'}$a$\text{'}||$ s$[$x$]==\text{'}$e$\text{'}||$ s$[$x$]==\text{'}$i$\text{'}||$ s$[$x$]==\text{'}$o$\text{'}||$ s$[$x$]==\text{'}$u$\text{'})\{$

v $=$ v $+1$;

$\}$

$\}$

return v;

$\}$

Exactly how many lines of code $($statements$)$ are executed by the method a$()$ in the worst case? Express your answer in terms of n$,$ the length of the string s$.$