cubo.cpp

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
	int a, b;
	cin >> a >> b;
	int ans = 0;
	set<ll> quadrado, cubo;
	for(int i=1; i<=10000; i++){
		quadrado.insert(i*i);
		cubo.insert(i*i*i);
	}
	for(auto x : quadrado){
		if(a <= x and x <= b and cubo.count(x)) ans++;
	}
	cout << ans << "\n";
	return 0;
}