#include <bits/stdc++.h> 
using namespace std;
int tinh(int a,int b) {
  int d=0;
  int sqrtb=sqrt(b);
  for (int i=ceil(sqrt(a));i<=sqrtb;++i) {
    int s=i*i;
    if (s>=a && s<=b) {
      d++;
    }
  }
  return d;
}
int main() {
  int a,b;
  cin>>a>>b;
  int kq=tinh(a,b);
  cout<<kq;
  return 0;
}

#include<bits/c++io.h>
#define ll long long
using namespace std;

int main(){
    ll a,b,k,s=1;
    cin>>a>>b;
    //meothinhle
    for (ll i=a;i<=b;++i){
        k=sprt(i);
        if (k*k==i)s+=1;
    }
    cout<<s;
    return 0;
}