#pragma GCC optimize ("O3")
#pragma GCC optimize ("unroll-loops")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
typedef long long ll;
typedef long double ld;
using namespace std;
const int N = 1e5 + 5;
ll a, b;
int ans;
set<ll> st;
bool check(ll cur) {
	if(cur % 10 == 0)
		return false;
	ll rev = 0;
	while(cur) {
		rev *= 10;
		rev += cur % 10;
		cur /= 10;
	}
	ll sq = sqrt(rev);
	return sq * sq == rev;
}
int main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> a >> b;
    for(int i = 1;1ll * i * i <= b;i++) {
		ll cur = 1ll * i * i;
		if(cur >= a && check(cur))
			ans++;
	}
	cout << ans;
    return 0;
}