#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int a, b, cnt = 0;

    cin >> a >> b;
    int pp, ogl;
    double y;
    int z;

    for (int x = 1; x * x <= b; ++x)
    {
        pp = x * x;
        if (pp >= a)
        {
            ogl = 0;
            while (pp)
            {
                ogl = ogl * 10 + pp % 10;
                pp /= 10;
            }

            y = sqrt(ogl);
            z = y;

            if (z == y) // daca ogl e patrat perfect
                cnt++;
        }
    }

    cout << cnt;
}