#24418: Python 求解!!!!(TLE)
71087@stu.cchs.chc.edu.tw
(~ pythOnia ChallengeR ~)
while 1:
try:
i,j=input().split();i=int(i);j=int(j)
except:break
else:
count=0
for rn_ in range(i,j+1):
if rn_!=1:
for rn in range(2,int(rn_**0.5+1)):
if rn_%rn==0:
break
else:
continue
else:
count+=1
elif rn_==1:
continue
print(count)
拜託高手指點