#include <bits/stdc++.h>
using namespace std;

using i64 = long long;

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    auto solve = [&]() {
        i64 A, B;
        cin >> A >> B;

        int ans = 0;

        for (i64 i = 1; i * i <= B; i++) {
            if (i * i < A) {
                continue;
            }
            i64 n = i * i;
            auto s = to_string(n);
            reverse(s.begin(), s.end());
            if (s[0] == '0') {
                continue;
            }
            n = stoll(s);
            i64 sq = sqrt(n);
            if (sq * sq == n) {
                ans++;
            }
        }

        cout << ans << '\n';
    };
    
    solve();
    
    return 0;
}