#include <cmath>
#include <iostream>
using namespace std;
int a, b, cnt;
int main()
{
cin >> a >> b;
for (int i = 1; i * i * i <= b; i ++)
if (i * i * i >= a)
if (sqrt(i * i * i) == (int) sqrt(i * i * i))
cnt ++;
cout << cnt;
return 0;
}