#include <bits/stdc++.h>
using namespace std;
#define int long long
#define taskname "CHINHPHUONG"
const int N = 1e9;
set<int>st;
set<int>s;
void scp1() {
    for (int i = 1; i * i <= N; i++)
        st.insert (pow (i, 2) );
}
void scp2() {
    for (int i = N + 1; i * i <= (int) 1e18; i++)
        s.insert (pow (i, 2) );
}
signed main() {
    ios::sync_with_stdio (false);
    cin.tie (nullptr);
    if (fopen (taskname".inp", "r") ) {
        freopen (taskname".inp", "r", stdin);
        freopen (taskname".out", "w", stdout);
    }
    int a, b, cnt = 0;
    cin >> a >> b;
    scp1();
    scp2();
    vector<int>vec (st.begin(), st.end() );
    vector<int>vac (s.begin(), s.end() );

    for (int i = 0; i < vec.size(); i++) {
        if (vec[i] >= a && vec[i] <= b)
            cnt++;
    }

    for (int i = 0; i < vac.size(); i++) {
        if (vac[i] >= a && vac[i] <= b)
            cnt++;
    }

    cout << cnt;
}