#include<bits/stdc++.h>
#define int long long
#define FIO ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

using namespace std;

const int N = 1e5 + 20, M = 1e6 + 5;
const int mod = 998244353;
void debug() {
#ifdef Debug
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
#endif
}

void getAnswer()
{   
    int a, b, ans = 0;
    cin >> a >> b;
    for(int i = 1;i * i <= b;++i)
    {
        if((i * i) >= a and (i * i) <= b and (i * i) % 10 != 0)
        {
            string s,rev;
            s = to_string(i * i), rev = s;
            reverse(rev.begin(), rev.end());
            int b = stoll(rev, nullptr, 0);
            int sqr = sqrt(b);
            if(sqr * sqr == b)
                ++ans;
        }
    }
    cout << ans;
}
signed main()
{
    FIO
    debug();
    int t = 1;
    //cin >> t;
    while(t--)
        getAnswer();
    return 0;

}