擅长:python、mysql、java
<pre class="lang-py prettyprint-override"><code>F=int(input())
S=int(input())
G=int(input())
L=int(input())
R=int(input())
L*=-1
Fl=1-L
Fr=F-R
h0=set()
n=0
while True:
if S<G:
S+= R if S<=Fr else L
elif G<S:
S+= L if Fl<=S else R
else:
print(n)
break
if S in h0:
print('not possible')
break
h0.add(S)
n+=1
</code></pre>