580 B | 580 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
i = 1
a = ii()
b = ii()
A = set()
B = set()
while i * i <= b:
if a <= i ** 2 <= b:
A.add(i * i)
if a <= i ** 3 <= b:
B.add(i ** 3)
i += 1
print(len(A.intersection(B)))
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()