try:

while True:

list1=input().split(" ")

list1=[int(i)for i in list1]

num=0

if list1[0]==0 and list1[1]==0:

print()

else:

for i in range(list1[0],list1[1]+1):

if list1[0]<=i**2 and list1[1]>=i**2:

num+=1

print(num)

except EOFError:

pass